Mapping Mountains - Hill Reclassifications - Y Trichant

Y Trichant – Hill Reclassifications

Y Trichant are the Welsh hills at or above 300m and below 40om in height that have a minimum drop of 30m, with these hills forming the 300m height band within the listing of the Twmpau (thirty welsh metre prominences and upward).  Accompanying the main P30 list is a sub list entitled the 300m Sub-Trichant with the qualification to this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The Introduction to this list giving its publication history appeared on Mapping Mountains on 13.05.17.

The list is authored by Myrddyn Phillips and the posts that have appeared on Mapping Mountains detailing the additions, reclassifications and deletions to the main P30 list and the sub list appear below presented chronologically in receding order.

Mapping Mountains - Hill Reclassifications - Y Trichant

Pt. 360.1m (SN 604 447) – Sub-Trichant reclassified to Trichant (105th reclassification)

Significant Height Revisions post for Pt. 360.1m

Significant Name Changes post for Pt. 360.1m

 

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Pt. 360.1m (SN 604 447)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is now listed by the Point (Pt. 360.1m) notation as an appropriate name for it either from historic research or local enquiry has not been found, and it is adjoined to the Elenydd group of hills, which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and it is positioned with a minor road to its north-east and the A482 road to its south-west, and has the town of Llanbedr Pont Steffan (Lampeter) towards the north-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

When the sub list was standardised and interpolated heights and drop values also included, the details for this hill were re-evaluated and it was listed with an estimated c 33m of drop, based on the 357m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 324m bwlch height, based on interpolation of 10m contouring between 320m – 330m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.  

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 360.1m summit height and an estimated c 324m bwlch height, with these values giving this hill an estimated c 36m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Pt. 360.1m 

OS 1:50,000 map:  146

Summit Height:  360.1m (LIDAR)                                                           

Summit Grid Reference:  SN 60451 44797 (LIDAR) 

Bwlch Height:  c 324m (interpolation) 

Bwlch Grid Reference:  SN 61574 45299 (interpolation) 

Drop:  c 36m (LIDAR summit and interpolated bwlch) 

 

Myrddyn Phillips (September 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Ciliau (SN 951 542) – Trichant reclassified to Sub-Trichant (104th reclassification)

 

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Ciliau (SN 951 542)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Ciliau and it is adjoined to the Elenydd group of hills, which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and it is positioned with minor roads to its north and west, and the B4358 road to its south-east, and has the village of Beulah towards the south-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

When the sub list was standardised and interpolated heights and drop values also included, the details for this hill were re-evaluated and it was listed with an estimated c 33m of drop, based on the 377m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and the 1:25,000 Explorer map and an estimated c 344m bwlch height based on interpolation of 10m contouring between 340m – 350m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Since publication of the P30 lists of Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the old Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available maps and for this hill it had a 347m bwlch spot height positioned at SN 94905 54722, and when coupled with the 377m summit spot height gave this hill 30m of drop. 

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the reclassification of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 376.1m summit height and a 346.3m bwlch height, with these values giving this hill 29.8m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Ciliau 

OS 1:50,000 map:  147

Summit Height:  376.1m (LIDAR)                                                           

Summit Grid Reference:  SN 95121 54281 (LIDAR) 

Bwlch Height:  346.3m (LIDAR) 

Bwlch Grid Reference:  SN 94897 54729 (LIDAR) 

Drop:  29.8m (LIDAR) 

 

Myrddyn Phillips (September 2021)

 

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Foel (SN 680 459) – Sub-Trichant reclassified to Trichant (103rd reclassification)

 

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Foel and it is adjoined to the Elenydd group of hills, which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and it is positioned with minor roads to its west, south and east, and has the A482 road farther to its south-west and the village of Pumsaint towards the south south-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

When the sub list was standardised and interpolated heights and drop values also included, the details for this hill were re-evaluated and it was listed with an estimated c 32m of drop, based on the 377m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and the 1:25,000 Explorer map and an estimated c 345m bwlch height based on interpolation of 10m contouring between 340m – 350m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Since publication of the P30 lists of Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the old Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available maps and for this hill it had a 345m bwlch spot height positioned at SN 68115 46192, and when coupled with the 377m summit spot height gave this hill 32m of drop. 

The details for this hill were subsequently re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This mapping had bwlch contouring between 345m – 350m with interpolation suggesting an estimated c 348m bwlch height, which when coupled with the 377m summit spot height would give this hill an estimated c 29m of drop.  However, for now the hill remains listed with 32m of drop. 

Extract from the OS Maps website

Therefore, the reclassification of this hill from Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 377m summit height and a 345m bwlch height, with these values giving this hill 32m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Foel 

OS 1:50,000 map:  146

Summit Height:  377m (spot height)                                                           

Summit Grid Reference:  SN 68012 45933 (hand-held GPS via DoBIH) 

Bwlch Height:  345m (spot height) 

Bwlch Grid Reference:  SN 68115 46192 (spot height) 

Drop:  32m (spot height summit and bwlch) 

 

Myrddyn Phillips (September 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Moel Cryniarth (SH 963 393) – Trichant reclassified to Sub-Trichant (102nd reclassification)

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Moel Cryniarth (SH 963 393)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Moel Cryniarth, and it is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with a minor road to its west and the A494 road to its south-east, and has the town of Y Bala towards the south-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 30m of drop, based on an estimated c 321m summit height and an estimated c 291m bwlch height, with both heights based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR summit image of Moel Cryniarth

Therefore, the reclassification of this hill from Trichant status is due to LIDAR analysis, resulting in a 319.8m summit height and a 290.5m bwlch height, with these values giving this hill 29.3m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Moel Cryniarth 

OS 1:50,000 map:  125

Summit Height:  319.8m (LIDAR)                                                           

Summit Grid Reference:  SH 96353 39358 (LIDAR) 

Bwlch Height:  290.5m (LIDAR) 

Bwlch Grid Reference:  SH 96628 39884 (LIDAR) 

Drop:  29.3m (LIDAR) 

 

Myrddyn Phillips (September 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Banc (SN 723 729) – Sub-Trichant reclassified to Trichant (101st reclassification)

Survey post for Banc

Significant Name Changes post for Banc

 

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Banc (SN 723 729)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Banc and this was derived from the Tithe map, and it is adjoined to the Elenydd group of hills, which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and is positioned with minor roads to its north-east, north-west and south, and has the B4343 road farther to its east, and has the village of Pont-rhyd-y-groes towards the east south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

When the sub list was standardised and interpolated heights and drop values also included, the details for this hill were re-evaluated and it was listed with an estimated c 30m of drop, based on the 316m summit spot height and an estimated c 286m bwlch height based on interpolation of 10m contouring between 280m – 290m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Banc (SN 723 729)

LIDAR analysis confirms Banc to have over 30m of drop and as the summit of this hill has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes. 

The Trimble GeoXH 6000 gathering data at the summit of Banc

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis and a subsequent Trimble GeoXH 6000 survey, resulting in a 316.3m summit height and a 285.1m bwlch height, with these values giving this hill 31.2m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Banc 

OS 1:50,000 map:  135, 147

Summit Height:  316.3m (converted to OSGM15, Trimble GeoXH 6000)                                                           

Summit Grid Reference:  SN 72380 72987 (Trimble GeoXH 6000) 

Bwlch Height:  285.1m (LIDAR) 

Bwlch Grid Reference:  SN 72097 73104 (LIDAR) 

Drop:  31.2m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (September 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Hafod Las (SN 738 506) – Trichant reclassified to Sub-Trichant (100th reclassification)

 

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Hafod Las and it is adjoined to the Elenydd group of hills, which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and it is positioned with minor roads to its north, west, south and east, and has the village of Llanddewibrefi towards the north-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

After the sub list was standardised and interpolated heights and drop values also included, the details for this hill were re-evaluated and it was listed with an estimated c 31m of drop, based on the 385m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and the 1:25,000 Explorer map and an estimated c 354m bwlch height based on interpolation of 10m contouring between 350m – 360m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Since the publication of the P30 lists of Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the old Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available maps and for this hill it had a 354m bwlch spot height positioned at SN 73649 50811, and when coupled with the 385m summit spot height gave this hill 31m of drop. 

The details for this hill were subsequently re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This mapping had bwlch contouring between 355m – 360m with the position of the 354m bwlch spot height shown on the Ordnance Survey Vector Map Local below the 355m contour line.  This re-assessment resulted in the bwlch height being estimated as c 356m. 

Extract from the OS Maps website

Therefore, the reclassification of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 385m summit height and an estimated c 356m bwlch height, with these values giving this hill an estimated c 29m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Hafod Las 

OS 1:50,000 map:  146, 147

Summit Height:  385m (spot height)                                                           

Summit Grid Reference:  SN 73827 50659 (hand-held GPS via DoBIH) 

Bwlch Height:  c 356m (interpolation) 

Bwlch Grid Reference:  SN 73622 50811 (interpolation) 

Drop:  c 29m (spot height summit and interpolated bwlch) 

 

Myrddyn Phillips (August 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Ffridd y Tŷ (SH 962 402) – Sub-Trichant addition (99th reclassification)

Significant Name Changes post for Ffridd y Tŷ

 

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Ffridd y Tŷ (SH 962 402)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Ffridd y Tŷ and this was derived from the Tithe map, and it is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with a minor road to its immediate south-east and the A494 road farther to its south-east, and has the town of Y Bala towards the south-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 24m of drop, based on the 369m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 345m bwlch height based on interpolation of 10m contouring between 340m – 350m. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 369.5m summit height and a 344.2m bwlch height, with these values giving this hill 25.3m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Ffridd y Tŷ 

OS 1:50,000 map:  125

Summit Height:  369.5m (LIDAR)                                                           

Summit Grid Reference:  SH 96235 40269 (LIDAR) 

Bwlch Height:  344.2m (LIDAR) 

Bwlch Grid Reference:  SH 96057 40317 (LIDAR) 

Drop:  25.3m (LIDAR) 

 

Myrddyn Phillips (August 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Knowle Hill (SO 213 617) – Sub-Trichant reclassified to Trichant (98th reclassification)

Survey post for Knowle Hill

 

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and assisted by Aled Williams. 

Knowle Hill (SO 213 617)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Knowle Hill and it is adjoined to the Fforest Glud group of hills, which are situated in the eastern part of Mid and West Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its west, the B4372 road to its south-east and the A44 road farther to its south-east, and has the village of Maesyfed (New Radnor) towards the south. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 29m of drop, based on the 387m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and the 1:25,000 Explorer map and an estimated c 358m bwlch height based on interpolation of 5m contouring between 355m – 360m that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Since the publication of the P30 lists of Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the old Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

The details for this hill were reassessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available maps and for this hill it had a 357m bwlch spot height positioned at SO 21437 61979, and when coupled with the 387m summit spot height gave this hill 30m of drop. 

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Knowle Hill (SO 213 617)

The result produced by LIDAR analysis confirms this hill as having over 30m of drop, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes. 

The Trimble GeoXH 6000 gathering data at the summit of Knowle Hill

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis and a subsequent Trimble GeoXH 6000 survey, resulting in a 387.9m summit height and a 357.7m bwlch height, with these values giving this hill 30.2m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Fforest Glud 

Name:  Knowle Hill 

OS 1:50,000 map:  137, 148

Summit Height:  387.9m (converted to OSGM15, Trimble GeoXH 6000)                                                           

Summit Grid Reference:  SO 21397 61735 (Trimble GeoXH 6000) 

Bwlch Height:  357.7m (LIDAR) 

Bwlch Grid Reference:  SO 21337 61955 (LIDAR) 

Drop:  30.2m (Trimble GeoXH 6000 and LIDAR bwlch) 

 

Myrddyn Phillips (August 2021) 

Mapping Mountains - Hill Reclassifications - Y Trichant

Warren Bank (SO 138 703) – Sub-Trichant addition (97th reclassification)

Survey post for Warren Bank

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Warren Bank (SO 138 703)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Warren Bank and it is adjoined to the Beacon Hill group of hills, which are situated in Mid and West Wales (Region B, Sub-Region B1), and it is encircled by minor roads with the B4356 road farther to its north, the A483 road farther to its west and the A488 road farther to its south-east, and has the village of Llanbister towards the north-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 22m of drop, based on the 349m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 327m bwlch height based on interpolation of 10m contouring between 320m – 330m. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Warren Bank (SO 138 703)

The result produced by LIDAR analysis confirms this hill as having over 20m of drop, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes. 

The Trimble GeoXH 6000 gathering data at the summit of Warren Bank

Therefore, the addition of this hill to Sub-Trichant status is due to LIDAR analysis and a subsequent Trimble GeoXH 6000 survey, resulting in a 348.5m summit height and a 325.5m bwlch height, with these values giving this hill 23.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Beacon Hill 

Name:  Warren Hill 

OS 1:50,000 map:  136, 148

Summit Height:  348.5m (converted to OSGM15, Trimble GeoXH 6000)                                                           

Summit Grid Reference:  SO 13803 70384 (Trimble GeoXH 6000) 

Bwlch Height:  325.5m (LIDAR) 

Bwlch Grid Reference:  SO 13603 70747 (LIDAR) 

Drop:  23.0m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (August 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Mynydd Tŷ’r Sais (SH 855 004) – Sub-Trichant reclassified to Trichant (96th reclassification)

Survey post for Mynydd Tŷ’r Sais

Significant Height Revisions post for Mynydd Tŷ’r Sais

Summit Relocations post for Mynydd Tŷ’r Sais

  

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by a Trimble GeoXH 6000 survey, prompted by an enquiry from Ronnie Bowron based on detail in the summit analysis programme produced by Joe Nuttall. 

Mynydd Tŷ'r Sais (SH 855 004)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Mynydd Tŷ’r Sais and it is adjoined to the Pumlumon group of hills, which are situated in the north-western part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the A470 road to its north, minor roads to its west and south, and the B4518 road to its east, and has the village of Llanbrynmair towards the north-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 26m of drop, based on the 359m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and the 1:25,000 Explorer map and the 333m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Since the original publication of the P30 lists of Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the mapping on the OS Maps website and the WalkLakes website. 

One of the resources now available online is the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This mapping shows an uppermost 360m ring contour and bwlch contouring much nearer the 330m height when compared to the contouring on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the OS Maps website

Another resource now available online is the mapping on the WalkLakes website which hosts an interactive map originated from the Ordnance Survey Open Data programme.  This map has many spot heights not on other publicly available Ordnance Survey maps and for this hill a 362m spot height is given on the area of its summit and again the bwlch contouring is much nearer the 330m height when compared to the contouring on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the WalkLakes website

These details resulted in this hill being prioritised for a Trimble GeoXH 6000 survey.  This took place on the 30.03.21 resulting in the hill being confirmed as having more than 30m of drop. 

The Trimble GeoXH 6000 gathering data at the summit of Mynydd Tŷ'r Sais

The Trimble GeoXH 6000 gathering data at the bwlch of Mynydd Tŷ'r Sais

Therefore, the reclassification of this hill from Sub-Trichant status is due to a Trimble GeoXH 6000 survey, resulting in a 362.2m summit height and a 329.9m bwlch height, with these values giving this hill 32.2m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Pumlumon 

Name:  Mynydd Tŷ’r Sais 

OS 1:50,000 map:  135, 136

Summit Height:  362.2m (converted to OSGM15)                                                           

Summit Grid Reference:  SH 85514 00483 

Bwlch Height:  329.9m (converted to OSGM15) 

Bwlch Grid Reference:  SH 86220 00690 

Drop:  32.2m 

 

Myrddyn Phillips (July 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Foel Dryll (SH 942 379) – Sub-Trichant addition (95th reclassification)

Significant Name Changes post for Foel Dryll

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Foel Dryll and this was derived from the Ordnance Surveys series of Six-Inch maps and it is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with the A4212 road to its west and the A494 road to its south, and has the town of Y Bala towards the south-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 20m of drop, based on the 345m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 325m bwlch height based on interpolation of 10m contouring between 320m – 330m. 

Extract from the Ordnance Survey 1:25,000 Explorer map

The details for this hill were subsequently re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This resulted in its bwlch height being listed as an estimated c 324m based on interpolation of 5m contouring between 320m – 325m. 

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 345m summit height and an estimated c 324m bwlch height, with these values giving this hill an estimated c 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Foel Dryll 

OS 1:50,000 map:  125

Summit Height:  345m (spot height)                                                           

Summit Grid Reference:  SH 94261 37960 (spot height) 

Bwlch Height:  c 324m (interpolation) 

Bwlch Grid Reference:  SH 94339 38162 (interpolation) 

Drop:  c 21m (spot height summit and interpolated bwlch) 

 

Myrddyn Phillips (July 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Bryn Prys (SH 874 501) – Sub-Trichant addition (94th reclassification)

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Bryn Prys (SH 874 501)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Bryn Prys and it is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with minor roads to its north, west and east, with farther afield the A5 road to its north and the B4407 road to its west, and has the village of Pentrefoelas towards the north. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 20m of drop based on the 324m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 304m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 324.0m summit height and a 303.9m bwlch height, with these values giving this hill 20.1m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Bryn Prys 

OS 1:50,000 map:  116

Summit Height:  324.0m (LIDAR)                                                           

Summit Grid Reference:  SH 87462 50104 (LIDAR) 

Bwlch Height:  303.9m (LIDAR) 

Bwlch Grid Reference:  SH 87395 49989 (LIDAR) 

Drop:  20.1m (LIDAR) 

 

Myrddyn Phillips (June 2021)

 

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Banc (SN 721 762) – Sub-Trichant addition (93rd reclassification)

Survey post for Banc

Significant Height Revisions post for Banc

Significant Name Changes post for Banc

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Banc (SN 721 762)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Banc and this was derived from the Tithe map, and it is adjoined to the Elenydd group of hills which are situated in the central part of the Mid and West Wales Region (Region B, Sub-Region B2), and it is encircled by minor roads with farther afield the A4120 road to its north and the B4343 road to its east, and has the village of Pontarfynach (Devil’s Bridge) towards the east north-east. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

Extract from the Ordnance Survey 1:25,000 Explorer map

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 22m of drop based on the 350m summit spot height and the 328m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  The 350m summit spot height is now shown on the interactive mapping available on the Magic Maps website.

Extract from the Magic Maps website

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Banc (SN 721 762)

LIDAR analysis confirms this hill to have over 20m of drop, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes. 

The Trimble GeoXH 6000 gathering data at the summit of Banc

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis and a subsequent Trimble GeoXH 6000 summit survey, resulting in a 350.9m summit height and a 329.1m bwlch height, with these values giving this hill 21.7m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Elenydd 

Name:  Banc 

OS 1:50,000 map:  135, 147

Summit Height:  350.9 (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference:  SN 72127 76209 (Trimble GeoXH 6000) 

Bwlch Height:  329.1m (LIDAR) 

Bwlch Grid Reference:  SN 72361 75991 (LIDAR) 

Drop:  21.7m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (May 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Foel Felen (SH 760 527) – Sub-Trichant addition (92nd reclassification)

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Foel Felen (SH 760 527)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Foel Felen and it is adjoined to the Arenig group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A3), and it is positioned with the A470 road to its north and west, the A5 road to its east north-east and the B4406 road to its east, and has the village of Betws-y-coed towards the north-east. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 25m of drop based on the 368m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 343m bwlch height based on interpolation of 10m contouring between 340m – 350m.  With the interpolated bwlch height favoured over that of a 341m spot height that was not centred and considered too low on the valley to valley traverse. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 368.4m summit height and a 341.0m bwlch height, with these values giving this hill 27.4m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Arenig 

Name:  Foel Felen 

OS 1:50,000 map:  115

Summit Height:  368.4m (LIDAR)                                                           

Summit Grid Reference:  SH 76001 52763 (LIDAR) 

Bwlch Height:  341.0m (LIDAR) 

Bwlch Grid Reference:  SH 76123 52535 (LIDAR) 

Drop:  27.4m (LIDAR) 

 

Myrddyn Phillips (May 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Pt. 370.8m (SJ 195 581) – Trichant reclassified to Sub-Trichant (91st reclassification)

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Pt. 370.8m (SJ 195 581)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is being listed by the point (Pt. 370.8m) notation as an appropriate name for it either through local enquiry and / or historic research has not been found by the author, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north and south-east and the B5430 road to its west, and has the village of Llanarmon-yn-Iâl towards the south. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list with an estimated c 370m summit height. 

Extract from the Ordnance Survey 1:25,000 Explorer map

After the P30 lists were standardised, and interpolated heights and drop values also included, the details for this hill were re-assessed and it was listed with an estimated c 31m of drop based on the 370m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 339m bwlch height based on interpolation of 5m contouring between 335m – 340m. 

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the reclassification of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 370.8m summit height and a 341.2m bwlch height, with these values giving this hill 29.6m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Pt. 370.8m 

OS 1:50,000 map:  116

Summit Height:  370.8m (LIDAR)                                                           

Summit Grid Reference:  SJ 19584 58152 (LIDAR) 

Bwlch Height:  341.2m (LIDAR) 

Bwlch Grid Reference:  SJ 19854 58246 (LIDAR) 

Drop:  29.6m (LIDAR) 

 

Myrddyn Phillips (April 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Clogwyn Uchaf (SJ 262 459) – Sub-Trichant addition (90th reclassification)

Significant Name Changes post for Clogwyn Uchaf

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Clogwyn Uchaf (SJ 262 459)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Clogwyn Uchaf and this was derived from the Tithe map, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north-east and south, with the A539 road further to its south and the B5097 road further to its east, and has the village of Rhosllannerchrugog towards the east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 24m of drop based on the 315m summit spot height and an estimated c 291m bwlch height based on interpolation of 5m contouring between 290m – 295m that appear on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 314.4m summit height and a 289.5m bwlch height, with these values giving this hill 25.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Clogwyn Uchaf 

OS 1:50,000 map:  117

Summit Height:  314.4m (LIDAR)                                                           

Summit Grid Reference:  SJ 26286 45940 (LIDAR) 

Bwlch Height:  289.5m (LIDAR) 

Bwlch Grid Reference:  SJ 26381 47029 (LIDAR) 

Drop:  25.0m (LIDAR) 

 

Myrddyn Phillips (March 2021)

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Top Field (SJ 070 055) – Sub-Trichant reclassified to Trichant (89th reclassification)

Survey post for Top Field

Summit Relocations post for Top Field

Significant Name Changes post for Top Field

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Top Field (SJ 070 055)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Top Field and this was derived from local enquiry, and it is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads, with the A458 road further to its north and the B4389 road further to its east, and has the small town of Llanfair Caereinion towards the east north-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for the main P30 category. 

When the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 32m of drop based on the 335m summit spot height and an estimated c 303m bwlch height based on interpolation of 10m contouring that appear on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Top Field (SJ 070 055) 

The result produced by LIDAR analysis gives this hill 32.0m of drop with a summit height of 333.1m, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes. 

The Trimble GeoXH 6000 gathering data at the summit of Top Field

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis and a Trimble GeoXH 6000 survey, resulting in a 333.3m summit height and a 301.1m bwlch height, with these values giving this hill 32.2m of drop, which is sufficient for it to be classified as a Trichant.

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Top Field 

OS 1:50,000 map:  125

Summit Height:  333.3m (converted to OSGM15, Trimble GeoXH 6000)                                       

Summit Grid Reference:  SJ 07082 05572 (Trimble GeoXH 6000) 

Bwlch Height:  301.1m (LIDAR) 

Bwlch Grid Reference:  SJ 06237 05273 (LIDAR) 

Drop:  32.2m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Caer Drewyn (SJ 091 444) – Trichant addition (88th reclassification)

Significant Name Changes post for Caer Drewyn

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips, with a subsequent Leica GS15 survey conducted by John Barnard and Graham Jackson. 

Caer Drewyn (SJ 091 444)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is now listed by is Caer Drewyn, and this was derived from local enquiry by Aled Williams, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the A5104 road to its north, the B5437 road to its south and the B5436 road to its east, and has the village of Carrog towards the east south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list and given twin topped 314m map heighted summit status along with its adjacent hill positioned at SJ 094 443. 

Extract from the Ordnance Survey 1:25,000 Explorer map

After the P30 lists were standardised and interpolated heights and drop values also included, this hill was listed as the non-priority summit with 18m of drop based on the 314m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 296m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map, with its adjacent 314m twin summit given priority status and listed with an estimated c 91m of drop based on the 314m summit spot height and an estimated c 223m bwlch height based on interpolation of 10m contouring between 220m – 230m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. 

However, it was not until LIDAR became available that the details for these two summits could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.

 

LIDAR gives the following detail for each summit: 

313.0m positioned at SJ 09438 44364. 

313.1m positioned at SJ 09125 44411.

 

The summit of these two hills have now been surveyed by the Leica GS15 and it is this result that is being prioritised for this hill.

Therefore, the addition of this hill to Trichant status is due to LIDAR analysis and a subsequent Leica GS15 survey, resulting in a 313.5m summit height and a 222.7m bwlch height, with these values giving this hill 90.8m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Caer Drewyn 

OS 1:50,000 map:  125

Summit Height:  313.5m (Leica GS15)                                                           

Summit Grid Reference:  SJ 09127 44416 (Leica GS15) 

Bwlch Height:  222.7m (LIDAR) 

Bwlch Grid Reference:  SJ 09770 45600 (LIDAR) 

Drop:  90.8m (Leica GS15 summit and LIDAR bwlch) 

 

Myrddyn Phillips (March 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Mountain Park (SJ 094 443) – Trichant deletion (87th reclassification)

Significant Name Changes post for Mountain Park

There has been a deletion to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Mountain Park (SJ 094 443)

The criteria for the list that this deletion applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Mountain Park, and this was derived from the Tithe map, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the A5104 road to its north, the B5437 road to its south and the B5436 road to its east, and has the village of Carrog towards the south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list and given twin topped 314m map heighted summit status along with its adjacent hill positioned at SJ 091 444. 

After the P30 lists were standardised and interpolated heights and drop values also included, this hill was listed as the priority summit with an estimated c 91m of drop based on the 314m summit spot height and an estimated c 223m bwlch height based on interpolation of 10m contouring between 220m – 230m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, with its adjacent 314m twin summit given non-priority status and listed with 18m of drop based on the 314m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 296m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for these two summits could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.

 

LIDAR gives the following detail for each summit: 

313.0m positioned at SJ 09438 44364. 

313.1m positioned at SJ 09125 44411.

 

Therefore, the deletion of this hill from prioritised Trichant status is due to LIDAR analysis, resulting in a 313.0m summit height and a 295.7m bwlch height, with these values giving this hill 17.3m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Mountain Park 

OS 1:50,000 map:  125

Summit Height:  313.0m (LIDAR)                                                           

Summit Grid Reference:  SJ 09438 44364 (LIDAR) 

Bwlch Height:  295.7m (LIDAR) 

Bwlch Grid Reference:  SJ 09279 44430 (LIDAR) 

Drop:  17.3m (LIDAR) 

 

Myrddyn Phillips (February 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Gribin (SJ 215 470) – Sub-Trichant addition (86th reclassification)

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Gribin (SJ 215 470)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Gribin, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its west, south and east, with the A542 road further to its west, and has the town of Llangollen towards the south. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 23m of drop based on the 340m summit spot height and an estimated c 317m bwlch height based on interpolation of 5m contouring between 315m – 320m that appear on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 339.7m summit height and a 316.45m bwlch height, with these values giving this hill 23.3m of drop, which is sufficient for it to be classified as a Sub-Trichant.

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Gribin 

OS 1:50,000 map:  117

Summit Height:  339.7m (LIDAR)                                                           

Summit Grid Reference:  SJ 21574 47010 (LIDAR) 

Bwlch Height:  316.45m (LIDAR) 

Bwlch Grid Reference:  SJ 21643 47160 (LIDAR) 

Drop:  23.3m (LIDAR) 

 

Myrddyn Phillips (February 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Craig y Fron (SJ 289 570) – Sub-Trichant addition (85th reclassification)

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Craig y Fron (SJ 289 570)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Craig y Fron, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is encircled by minor roads with the A541 road to its north-east, the A5104 road to its north-west and the B5101 road to its south-west, and has the village of Caergwrle towards the east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 22m of drop based on the 324m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated bwlch height of c 302m based on interpolation of contours between 300m – 305m that appear on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 324.0m summit height and a 300.1m bwlch height, with these values giving this hill 23.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Craig y Fron 

OS 1:50,000 map:  117

Summit Height:  324.0m (LIDAR)                                                           

Summit Grid Reference:  SJ 28971 57067 (LIDAR) 

Bwlch Height:  300.1m (LIDAR) 

Bwlch Grid Reference:  SJ 29269 57113 (LIDAR) 

Drop:  23.8m (LIDAR)

Myrddyn Phillips (January 2021) 

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Pt. 353.6m (SJ 249 539) – Sub-Trichant reclassified to Trichant (84th reclassification)

Survey post for Pt. 353.6m

Summit Relocations post for Pt. 353.6m

Significant Name Changes post for Pt. 353.6m

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their location, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey  conducted by Myrddyn Phillips.

LIDAR image of Pt. 353.7m (SJ 249 539)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is being listed by the point (Pt. 353.6m) notation as an appropriate name for it either through local enquiry and / or historic research has not been found by the author, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north, east and south and has the B5430 road to its west and farther afield the A525 road to its south, and has the village of Bwlchgwyn towards the east south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for the main P30 category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 31m of drop based on the 353m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and which is positioned at SJ 251 543 and an estimated c 322m bwlch height based on interpolation of 5m contouring that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR analysis resulted in the confirmation of this hill’s summit relocation and as the summit of this hill has now been surveyed with the Trimble GeoXH 6000, it is this result that is being prioritised for listing purposes.

The Trimble GeoXH 6000 gathering data at the summit of Pt. 353.6m (SJ 249 539)

Therefore, the reclassification of this hill from Sub-Trichant status is due to LIDAR summit analysis and a subsequent Trimble GeoXH 6000 survey and detail on contemporary maps produced from Ordnance Survey data, resulting in a 353.6m summit height and an estimated c 322m bwlch height, with these values giving this hill an estimated c 32m of drop, which is sufficient for it to be classified as a Trichant.

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Pt. 353.6m 

OS 1:50,000 map:  117

Summit Height:  353.6m (converted to OSGM15, Trimble GeoXH 6000)  

Summit Grid Reference:  SJ 24997 53989 (Trimble GeoXH 6000) 

Bwlch Height:  c 322m (interpolation) 

Bwlch Grid Reference:  SJ 24041 53999 (interpolation) 

Drop:  c 32m (Trimble GeoXH 6000 summit and interpolated bwlch) 

 

Myrddyn Phillips (January 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Lan Ffynnon Las and Disgwylfa (SN 998 433) – Sub-Trichant deletion (83rd reclassification)

There has been a deletion to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips. 

LIDAR image of Lan Ffynnon Las and Disgwylfa (SN 998 433)

The criteria for the list that this deletion applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Lan Ffynnon Las and Disgwylfa and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the south-eastern part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the B4519 road to its west and the B4520 road to its east, and has the hamlet of Capel Uchaf (Upper Chapel) towards the south south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 20m of drop based on the 393m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 373m bwlch height based on interpolation of 10m contouring between 370m – 380m. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the deletion of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 391.9m summit height and a 372.0m bwlch height, with these values giving this hill 19.9m of drop, which is insufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lan Ffynnon Las and Disgwylfa 

OS 1:50,000 map:  147, 160

Summit Height:  391.9m (LIDAR)                                                           

Summit Grid Reference:  SN 99803 43305 (LIDAR) 

Bwlch Height:  372.0m (LIDAR) 

Bwlch Grid Reference:  SN 99999 43777 (LIDAR) 

Drop:  19.9m (LIDAR) 

 

Myrddyn Phillips (January 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Y Dduallt (ST 041 961) – Sub-Trichant reclassified to Trichant (82nd reclassification)

Summit Relocations post for Y Dduallt

Significant Height Revisions post for Y Dduallt

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill initially confirmed by JoeNuttall who produced a summit analysis programme using LIDAR, and then by LIDAR analysis initially conducted by Jim Bloomer and subsequently by Myrddyn Phillips. 

LIDAR image of Y Dduallt (ST 041 961)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Y Dduallt, and it is adjoined to the Cymoedd Morgannwg group of hills, which are situated in the central part of South Wales (Region C, Sub-Region C2), and it is encircled by minor roads with the A4233 road further to its west and the A4059 road and the A470 road further to its east, and has the town of Pontypridd towards the south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with 21m of drop based on the 354m summit spot height and the 333m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map.  With its adjacent hill positioned at ST 036 958 listed with an estimated c 360m summit height based on the uppermost ring contour that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Both summits have now been analysed via LIDAR.  The result produced by LIDAR analysis gives this hill a 363.0m summit height and as this is higher than the 361.4m adjacent summit positioned at ST 03647 95811, their respective bylchau are swapped.

Therefore, the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 363.0m summit height and a 312.2m bwlch height, with these values giving this hill 50.8m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Cymoedd Morgannwg 

Name:  Y Dduallt 

OS 1:50,000 map:  170

Summit Height:  363.0m (LIDAR)                                                           

Summit Grid Reference:  ST 04179 96153 (LIDAR) 

Bwlch Height:  312.2m (LIDAR) 

Bwlch Grid Reference:  ST 03283 95733 (LIDAR) 

Drop:  50.8m (LIDAR) 

 

Myrddyn Phillips (January 2021)

Mapping Mountains - Hill Reclassifications - Y Trichant

Blaen Pathiog (SN 927 820) – Sub-Trichant reclassified to Trichant (81st reclassification)

Significant Height Revisions post for Blaen Pathiog

Summit Relocations post for Blaen Pathiog

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

LIDAR image of Blaen Pathiog (SN 927 820)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Blaen Pathiog and it is adjoined to the Pumlumon group of hills, which are situated in the north-western part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the A470 road to its south-east, and has the town of Llanidloes towards the north-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for the main P30 category.  

Extract from the Ordnance Survey 1:25,000 Explorer map

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 33m of drop based on the 379m summit spot height that appeared on the Ordnance Survey Vector Map Local that was hosted on the Geograph website and an estimated c 346m bwlch height, based on interpolation of 10m contouring between 340m – 350m.  The 379m summit spot height has latterly also appeared on the online mapping available on the Magic Maps website.  

Extract from the Magic Maps website

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

The result produced by LIDAR analysis gives this hill a 376.1m summit height, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes.

The Trimble GeoXH 6000 gathering data at the summit of Blaen Pathiog

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis and a subsequent Trimble GeoXH 6000 survey, resulting in a 376.3m summit height and a 343.3m bwlch height, with these values giving this hill 33.1m of drop, which is sufficient for it to be classified as a Trichant.

 

The full details for the hill are: 

Group:  Pumlumon 

Name:  Blaen Pathiog 

OS 1:50,000 map:  136

Summit Height:  376.3m (converted to OSGM15, Trimble GeoXH 6000)  

Summit Grid Reference:  SN 92775 82001 (Trimble GeoXH 6000) 

Bwlch Height:  343.3m (LIDAR) 

Bwlch Grid Reference:  SN 92760 81765 (LIDAR) 

Drop:  33.1m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Myrddyn Phillips (December 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Mountain (SJ 235 555) – Sub-Trichant addition (80th reclassification)

Significant Name Changes post for Mountain

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Mountain (SJ 235 555)

The criteria for the list that this addition applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

The criteria for the list that this addition applies to are:

The name the hill is listed by is Mountain, and this was derived from the Tithe map, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the A5104 road to its west and the B5430 road to its south, and has the village of Treuddyn towards the north-north-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with 25m of drop based on the 334m summit spot height and the 309m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 334.0m summit height and a 309m bwlch height, with these values giving this hill 25m of drop, which is sufficient for it to be classified as a Sub-Trichant.

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Mountain 

OS 1:50,000 map:  117

Summit Height:  334.0m (LIDAR)                                                           

Summit Grid Reference:  SJ 23575 55527 (LIDAR) 

Bwlch Height:  309m (spot height) 

Bwlch Grid Reference:  SJ 23660 55008 (spot height) 

Drop:  25m (LIDAR summit and spot height bwlch) 

 

Myrddyn Phillips (December 2020)

 

 

Mapping Mountains - Hill Reclassifications - Y Trichant

Coedcae Mawr (ST 036 958) – Trichant reclassified to Sub-Trichant (79th reclassification)

Significant Name Changes post for Coedcae Mawr

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill initially confirmed by Joe Nuttall who produced a summit analysis programme using LIDAR, and then by LIDAR analysis initially conducted by Jim Bloomer and subsequently by Myrddyn Phillips. 

LIDAR image of Coedcae Mawr (ST 036 958)

The criteria for the list that this reclassification applies to are: 

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Coedcae Mawr and this was derived from the Tithe map, and it is adjoined to the Cymoedd Morgannwg group of hills, which are situated in the central part of South Wales (Region C, Sub-Region C2), and it is encircled by minor roads with the A4233 road further to its west and the A4059 road and the A470 road further to its east, and has the town of Pontypridd towards the south-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list with an estimated summit height of c 360m. 

When the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 44m of drop based on the estimated c 360m summit height and an estimated c 316m bwlch height, with both heights based on interpolation of 10m contouring that appear on the Ordnance Survey 1:25,000 Explorer map.  With its adjacent hill positioned at ST 041 961 listed with a 354m summit height based on the spot height that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Both summits have now been analysed via LIDAR.  The result produced by LIDAR analysis gives this hill a 361.4m summit height and as this is lower than the 363.0m adjacent summit positioned at ST 04179 96153, their respective bylchau are swapped.

Therefore, the reclassification of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 361.4m summit height and a 333.3m bwlch height, with these values giving this hill 28.1m of drop, which is insufficient for it to be classified as a Trichant.

 

The full details for the hill are: 

Group:  Cymoedd Morgannwg 

Name:  Coedcae Mawr 

OS 1:50,000 map:  170

Summit Height:  361.4m (LIDAR)                                                           

Summit Grid Reference:  ST 03647 95811 (LIDAR) 

Bwlch Height:  333.3m (LIDAR) 

Bwlch Grid Reference:  ST 03865 96007 (LIDAR) 

Drop:  28.1m (LIDAR)

 

Myrddyn Phillips (December 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Pt. c 362m (SJ 205 541) – Sub-Trichant addition (78th reclassification)

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data.

The criteria for the list that this addition applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is being listed by the point (Pt. c 362m) notation as an appropriate name for it either through local enquiry and / or historic research has not been found by the author, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the B5430 road to its north, the B5431 road to its west and the A5104 road to its south-east, and has the village of Llanarmon-yn-Iâl towards the north-west.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category.  

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 24m of drop based on an estimated c 362m summit height and an estimated c 338m bwlch height, with both based on interpolation of 5m contouring that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in an estimated c 362m summit height and an estimated c 338m bwlch height, with these values giving this hill an estimated c 24m of drop, which is sufficient for it to be classified as a Sub-Trichant.

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Pt. c 362m

OS 1:50,000 map:  117

Summit Height:  c 362m (interpolation)

                                                           

Summit Grid Reference:  SJ 20561 54192 (interpolation)

Bwlch Height:  c 338m (interpolation)

Bwlch Grid Reference:  SJ 20990 54526 (interpolation)

Drop:  c 24m (interpolated summit and bwlch)

Myrddyn Phillips (December 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Mynydd Fynnon Wen (SN 726 793) – Sub-Trichant reclassified to Trichant (77th reclassification)

Significant Name Changes post for Mynydd Fynnon Wen

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Mynydd Fynnon Wen (SN 726 793)

The criteria for the list that this reclassification applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Mynydd Fynnon Wen and it is adjoined to the Pumlumon group of hills, which are situated in the north-western part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the A44 road to its north and the A4120 road to its south and east, and has the village of Ponterwyd towards the east north-east.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for the main P30 category. 

Extract from the Ordnance Survey 1:50,000 Explorer map

When the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 30m of drop based on the 376m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and an estimated c 346m bwlch height, based on interpolation of 10m contouring between 340m – 350m.  With its adjacent hill positioned at SN 724 797 listed with a 378m summit height based on the spot height that appears on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.

Both summits have now been analysed via LIDAR.  The result produced by LIDAR analysis gives this hill a 376.4m summit height and as this is higher than the 375.8m adjacent summit positioned at SN 72420 79716, their respective bylchau are swapped.

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 376.4m summit height and a 333.4m bwlch height, with these values giving this hill 43.0m of drop, which is sufficient for it to be classified as a Trichant.

The full details for the hill are:

Group:  Pumlumon

Name:  Mynydd Fynnon Wen

OS 1:50,000 map:  135, 147

Summit Height:  376.4m (LIDAR)

                                                           

Summit Grid Reference:  SN 72691 79343 & SN 72693 79347 (LIDAR)

Bwlch Height:  333.4m (LIDAR)

Bwlch Grid Reference:  SN 72591 80115 (LIDAR)

Drop:  43.0m (LIDAR)

Myrddyn Phillips (December 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Square Field (SJ 070 031) – Trichant reclassified to 200m Twmpau (76th reclassification)

Survey post for Square Field

Significant Name Changes post for Square Field

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales and the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.

Square Field (SJ 070 031)

The criteria for the two listings that this reclassification applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

200m Twmpau – Welsh hills at or above 200m and below 300m in height that have 30m minimum drop, with an accompanying sub list entitled the 200m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 200m and below 300m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

The 200m Twmpau by Myrddyn Phillips

The name the hill is being listed by is Square Field and this was derived from local enquiry, and it is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads, with also the A458 road to its north, the A470 road to its south-west and the B4389 road to its east, and has the village of Adfa towards the south south-west.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list and listed with a 300m summit height, based on the spot height that appears on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR image of Square Field (SJ 070 031)

The result produced by LIDAR analysis gives this hill a 299.4m summit height, and as the summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes.

The Trimble GeoXH 6000 gathering data at the summit of Square Field

Therefore, the confirmation of the reclassification of this hill from Trichant status is due to LIDAR analysis and a Trimble GeoXH 6000 survey, resulting in 45.8m of drop, with a 299.4m summit height and a 253.6m bwlch height, with the summit height insufficient for Trichant status the therefore the hill is reclassified to a 200m Twmpau

The full details for the hill are:

Group:  Carnedd Wen

Name:  Square Field

OS 1:50,000 map:  136

Summit Height:  299.4m (converted to OSGM15, Trimble GeoXH 6000)

                                                           

Summit Grid Reference:  SJ 07034 03161 (Trimble GeoXH 6000)

Bwlch Height:  253.6m (LIDAR)

Bwlch Grid Reference:  SJ 06533 03161 (LIDAR)

Drop:  45.8m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Myrddyn Phillips (November 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Pt. 366m (SJ 207 568 & SJ 205 575) – Sub-Trichant addition (75th reclassification)

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data.

The criteria for the list that this addition applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is being listed by the point (Pt. 366m) notation as an appropriate name for it either through local enquiry and / or historic research has not been found by the author, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the B5430 road to its south and minor roads to its east, north and west, and has the town of Yr Wyddgrug (Mold) towards the north north-east.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category.  

When the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 19m of drop based on an estimated c 366m summit height and an estimated c 347m bwlch height, with both based on interpolation of 5m contouring with a small 365m uppermost contour given to two summits and contouring between 345m – 350m for the bwlch that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

Since publication of these P30 lists on Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the mapping on the WalkLakes website and the Magic Maps website.

The WalkLakes website hosts an interactive map originated from the Ordnance Survey Open Data programme.  This map has many spot heights not on other publicly available Ordnance Survey maps and for this hill a 366m spot height is given to the more northerly of the two summits which is positioned at SJ 205 575.

Extract from the WalkLakes website

Another resource available online is the interactive mapping originated from Ordnance Survey data hosted on the Magic Maps website.  This mapping shows the two summits with 366m spot heights, with the more southerly positioned at SJ 207 568, which for listing purposes is regarded as the prioritised summit.

Extract from the Magic Maps website

The details for this hill were also re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This resulted in its bwlch height being amended and estimated as c 346m based on interpolation of 5m contouring between 345m – 350m.

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 366m summit height and an estimated c 346m bwlch height, with these values giving this hill an estimated c 20m of drop, which is sufficient for it to be classified as a Sub-Trichant.

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Pt. 366m

OS 1:50,000 map:  117

Summit Height:  366m (spot heights)

                                                           

Summit Grid Reference:  SJ 20774 56802 & SJ 20505 57502 (spot heights)

Bwlch Height:  c 346m (interpolation)

Bwlch Grid Reference:  SJ 20750 57920 (interpolation)

Drop:  c 20m (spot height summits and interpolated bwlch)

Myrddyn Phillips (November 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Bryn Bras (SN 742 796) – Sub-Trichant reclassified to Trichant (74th reclassification)

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Bryn Bras (SN 742 796)

The criteria for the list that this reclassification applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Bryn Bras, and it is adjoined to the Pumlumon group of hills, which are situated in the north-western part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with a minor road to its immediate west and also the A44 road to its north and the A4120 road to its east, and has the village of Ponterwyd towards the north north-east.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the accompanying main P30 list, and was listed with a 372m summit height based on the spot height that appears on the Ordnance Survey 1:50,000 Landranger map.

Extract from the Ordnance Survey 1:50,000 Landranger map

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 30m of drop, based on the 372m summit spot height and an estimated c 342m bwlch height based on interpolation of 10m contouring between 340m – 350m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available maps and showed a 371m spot height for the summit of this hill, and when coupled with the re-interpolated bwlch height of c 371m, its listed drop remained at an estimated c 30m.

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 371.4m summit height and a 339.9m bwlch height, with these values giving this hill 31.5m of drop, which is sufficient for it to be classified as a Trichant.

The full details for the hill are:

Group:  Pumlumon

Name:  Bryn Bras

OS 1:50,000 map:  135, 147

Summit Height:  371.4m (LIDAR)

Summit Grid Reference:  SN 74245 79628 (LIDAR)

Bwlch Height:  339.9m (LIDAR)

Bwlch Grid Reference:  SN 74162 79597 (LIDAR)

Drop:  31.5m (LIDAR)

Myrddyn Phillips (November 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Nercwys Mountain (SJ 214 589) – Sub-Trichant addition (73rd reclassification)

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data.

The criteria for the list that this addition applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Nercwys Mountain, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is encircled by minor roads and also has the A494 road to its north-west and the A5104 road to its south-east, and has the town of Yr Wyddgrug (Mold) towards the north north-east.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category.  

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 21m of drop based on the 378m summit spot height that is adjoined to a triangulation pillar and an estimated c 357m bwlch height, with the latter based on interpolation of 5m contouring between 355m – 360m that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

The details for this hill were re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This resulted in its bwlch height remaining the same as an estimated c 357m based on interpolation of 5m contouring between 355m – 360m.

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 378m summit height and an estimated c 357m bwlch height, with these values giving this hill an estimated c 21m of drop, which is sufficient for it to be classified as a Sub-Trichant.

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Nercwys Mountain

OS 1:50,000 map:  117

Summit Height:  378m (triangulation pillar)

                                                           

Summit Grid Reference:  SJ 21444 58981 (triangulation pillar)

Bwlch Height:  c 357m (interpolation)

Bwlch Grid Reference:  SJ 21176 58854 (interpolation)

Drop:  c 21m (triangulation pillar summit and interpolated bwlch)

Myrddyn Phillips (November 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Nercwys Mountain (SJ 211 585) – Sub-Trichant addition (72nd reclassification)

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data.

The criteria for the list that this addition applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Nercwys Mountain, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is encircled by minor roads and also has the A494 road to its north-west and the A5104 road to its south-east, and has the town of Yr Wyddgrug (Mold) towards the north-east.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 25m of drop based on the 387m summit spot height and an estimated c 362m bwlch height, with the latter based on interpolation of 5m contouring between 360m – 365m that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

The details for this hill were re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This resulted in its bwlch height remaining the same as an estimated c 362m based on interpolation of 5m contouring between 360m – 365m.

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 387m summit height and an estimated c 362m bwlch height, with these values giving this hill an estimated c 25m of drop, which is sufficient for it to be classified as a Sub-Trichant.

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Nercwys Mountain

OS 1:50,000 map:  117

Summit Height:  387m (spot height)

                                                           

Summit Grid Reference:  SJ 21151 58517 (spot height)

Bwlch Height:  c 362m (interpolation)

Bwlch Grid Reference:  SJ 20735 58479 (interpolation)

Drop:  c 25m (spot height summit and interpolated bwlch)

Myrddyn Phillips (November 2020)

Mapping Mountains - Hill Reclassifications - Y Trichant

Cefn Tŷ Mawr (SN 986 576) – Sub-Trichant reclassified to Trichant (71st reclassification)

Survey post for Cefn Tŷ Mawr

There has been confirmation of a reclassification to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by a Trimble GeoXH 6000 survey and subsequent LIDAR analysis conducted by Myrddyn Phillips.

Cefn Tŷ Mawr (SN 986 576)

The criteria for the list that this reclassification applies to are:

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Cefn Tŷ Mawr, and it is adjoined to the Elenydd group of hills, which are situated in the western part of Mid and West Wales (Region B, Sub-Region B2), and it is positioned with the A470 road to its north-east and the B4358 road to its south-east, and has the village of Newbridge-on-Wye towards the east north-east.

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the accompanying main P30 list.

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 29m of drop, based on the 323m summit spot height and an estimated c 294m bwlch height, with the latter based on interpolation of 10m contouring between 290m – 300m that appear on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

Since publication of these P30 lists on Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, and it was this mapping that had a 292m spot height on the area of this hill’s bwlch, which when coupled with its 323m summit spot height gave this hill 31m of drop.

As the listed drop value of this hill was close to the minimum of 30m required for Trichant status, this hill was prioritised for a GNSS survey, and this took place on the 23^rd May 2015, resulting in 31.8m of drop.

Gathering data at the summit of Cefn Tŷ Mawr

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed against the Trimble GeoXH 6000 survey result.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.  LIDAR analysis resulted in the height and position of this hill’s bwlch being amended.

LIDAR image of Cefn Tŷ Mawr

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to a Trimble GeoXH 6000 survey and subsequent LIDAR analysis, resulting in a 324.2m summit height and a 292.0m bwlch height, with these values giving this hill 32.2m of drop, which is sufficient for it to be classified as a Trichant.

The full details for the hill are:

Group:  Elenydd

Name:  Cefn Tŷ Mawr

OS 1:50,000 map:  147

Summit Height:  324.2m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SN 98691 57665 (Trimble GeoXH 6000)

Bwlch Height:  292.0m (LIDAR)

Bwlch Grid Reference:  SN 98452 57819 (LIDAR)

Drop:  32.2m (Trimble GeoXH 6000 summit and LIDAR bwlch)

For details of the Trimble GeoXH 6000 survey of this hill

Myrddyn Phillips (November 2020)