Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Y Trichant - The 300m of Wales – 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 - The 300m Hills of Wales

Belan Hill (SO 051 901) – Sub-Trichant deletion (240th reclassification)

There has been a deletion from 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 Belan Hill (SO 051 901)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Belan Hill, and it is adjoined to the Hirddywel group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B2), and it is positioned with the A489 road to its north and minor roads to its west, south and east, and has the town of Y Drenewydd (Newtown) towards the 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 accompanying 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 an estimated c 311m summit height and an estimated c 291m bwlch height, with both heights based on interpolation of 5m contouring. 

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 311.4m summit height and a 292.5m bwlch height, with these values giving this hill 19.0m of drop, which is insufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Hirddywel 

Name:  Belan Hill 

OS 1:50,000 map:  136

Summit Height:  311.4m (LIDAR)                                                           

Summit Grid Reference:  SO 05114 90152 (LIDAR) 

Bwlch Height:  292.5m (LIDAR) 

Bwlch Grid Reference:  SO 05157 90001 & SO 05157 90000 (LIDAR) 

Drop:  19.0m (LIDAR) 

 

Myrddyn Phillips (November 2024) 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Morfil (SN 040 313) – Sub-Trichant addition (239th 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 Mynydd Morfil (SN 040 313)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Mynydd Morfil, and it is adjoined to the Mynydd Preseli group of hills, which are situated in the south-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4313 road to its north and a minor road to its south-west, and has the town of Abergwaun (Fishguard) towards the north-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 23m of drop, based on an estimated c 301m summit height and an estimated c 278m bwlch height, with both heights based on interpolation of 5m 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.

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 300.4m summit height and a 278.1m bwlch height, with these values giving this hill 22.2m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Preseli 

Name:  Mynydd M0rfil 

OS 1:50,000 map:  145

Summit Height:  300.4m (LIDAR)                                                           

Summit Grid Reference:  SN 04057 31302 (LIDAR) 

Bwlch Height:  278.1m (LIDAR) 

Bwlch Grid Reference:  SN 04718 31316 & SN 04723 31318 (LIDAR) 

Drop:  22.1m (LIDAR) 

 

Myrddyn Phillips (September 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Melyn (SN 021 362) – Sub-Trichant addition (238th 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 Mynydd Melyn (SN 021 362)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Mynydd Melyn, and it is adjoined to the Mynydd Preseli group of hills, which are situated in the south-western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its north and minor roads to its west and east, and has the town of Abergwaun (Fishguard) towards the 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 24m of drop, based on the 307m summit spot height adjoined to a triangulation pillar that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 283m 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 307.3m summit height and a 283.2m bwlch height, with these values giving this hill 24.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Preseli 

Name:  Mynydd Melyn 

OS 1:50,000 map:  145

Summit Height:  307.3m (LIDAR)                                                           

Summit Grid Reference:  SN 02195 36233 (LIDAR) 

Bwlch Height:  283.2m (LIDAR) 

Bwlch Grid Reference:  SN 02621 36353 (LIDAR) 

Drop:  24.0m (LIDAR) 

 

Myrddyn Phillips (September 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Llandyfalle (SO 088 361) – Sub-Trichant addition (237th reclassification)

Significant Name Changes post for Mynydd Llandyfalle

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 Mynydd Llandyfalle (SO 088 361) 

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Mynydd Llandyfalle and this was derived from the Ordnance Survey Draft Surveyors Map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned encircled by minor roads, with the B4520 road farther to its west, the A470 road farther to its south, east and north-east, and has the town of Talgarth towards the east south-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 20m of drop, based on the 347m summit spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 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.

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 347.7m summit height and a 327.1m bwlch height, with these values giving this hill 20.6m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Mynydd Llandyfalle 

OS 1:50,000 map:  160

Summit Height:  347.7m (LIDAR)                                                           

Summit Grid Reference:  SO 08800 36195 (LIDAR) 

Bwlch Height:  327.1m (LIDAR) 

Bwlch Grid Reference:  SO 08140 36189 (LIDAR) 

Drop:  20.6m (LIDAR) 

 

Myrddyn Phillips (September 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Llan Ucha Castell Madog (SO 027 385) – Sub-Trichant deletion (236th reclassification)

There has been a deletion from 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 Llan Ucha Castell Madog (SO 027 385)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Llan Ucha Castell Madog and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4520 road to its west and a minor road to its east, and has the small community of Capel Uchaf (Upper Chapel) towards the north-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 accompanying 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 21m of drop, based on the 399m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website which was entitled the Interactive Coverage Map and an estimated c 378m bwlch height, based on interpolation of 10m contouring between 370m – 380m. 

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

One of the resources recently available online is the mapping on the OS Maps website and the details for this hill were subsequently re-assessed against this mapping.  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 an uppermost 400m ring contour and bwlch contouring between 380m – 385m, with interpolation giving an estimated c 18m of drop.  Through discussion it was decided to wait for full LIDAR coverage before reassessing the status of this hill.

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 deletion of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 400.7m summit height and a 381.6m bwlch height, with these values giving this hill 19.1m 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:  Llan Ucha Castell Madog 

OS 1:50,000 map:  160

Summit Height:  400.7m (LIDAR)                                                           

Summit Grid Reference:  SO 02707 38531 (LIDAR) 

Bwlch Height:  381.6m (LIDAR) 

Bwlch Grid Reference:  SO 02779 38800 & SO 02780 38801 (LIDAR) 

Drop:  19.1m (LIDAR) 

 

Myrddyn Phillips (August 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Fforest (SO 086 389) – Sub-Trichant addition (235th reclassification)

Significant Name Changes post for Mynydd Fforest

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 Mynydd Fforest (SO 086 389)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Mynydd Fforest and this was derived from the Ordnance Survey Draft Suirveyors Map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its west and south, and the A470 road to its east, and has the small community of Erwyd (Erwood) towards the north 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 20m of drop, based on the 376m summit spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 356m bwlch height, based on interpolation of 10m contouring between 350m – 360m. 

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 375.6m summit height and a 353.55m bwlch height, with these values giving this hill 22.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Mynydd Fforest 

OS 1:50,000 map:  160

Summit Height:  375.6m (LIDAR)                                                           

Summit Grid Reference:  SO 08614 38958 & SO 08615 38959 (LIDAR) 

Bwlch Height:  353.55m (LIDAR) 

Bwlch Grid Reference:  SO 09049 38950 (LIDAR) 

Drop:  22.0m (LIDAR) 

 

Myrddyn Phillips (July 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Allt Cilhywi (SO 035 358) – Sub-Trichant reclassified to Trichant (234th 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 Allt Cilhywi (SO 035 358)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Allt Cilhywi, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north and the B4520 road to its west, and has the small community of Lower Chapel towards the west.

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 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 334m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 304m bwlch height, based on interpolation of 10m contouring between 300m – 310m.  The details for this hill were later re-assessed against the Ordnance Survey 1:25,000 Explorer map and the drop value amended to an estimated c 31m, based on an interpolated bwlch height of c 303m. 

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.

The initial reclassification of this hill from Trichant to Sub-Trichant status was based on analysis of the available 2m DTM LIDAR, at that stage no 1m DTM LIDAR was available, resulting in a 333.2m summit height and a 303.5m bwlch height, with these values giving this hill 29.7m of drop.  However, 1m LIDAR is now available and the details for this hill have been analysed using this.

Therefore, the reclassification of this hill from Sub-Trichant status is due to analysis of the latest available 1m DTM LIDAR, resulting in a 334.1m summit height and a 303.6m bwlch height, with these values giving this hill 30.5m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Allt Cilhywi 

OS 1:50,000 map:  160

Summit Height:  334.1m (LIDAR)                                                           

Summit Grid Reference:  SO 03505 35843 (LIDAR) 

Bwlch Height:  303.6m (LIDAR) 

Bwlch Grid Reference:  SO 03893 35958 (LIDAR) 

Drop:  30.5m (LIDAR) 

 

Myrddyn Phillips (July 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Trallwng (SN 965 311) – Sub-Trichant deletion (233rd reclassification)

There has been a deletion from 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 Trallwng (SN 965 311)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Mynydd Trallwng and this was derived from the Ordnance Survey Draft Surveyors map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north-east and south, and the A40 road farther to its south, and has the village of Pontsenni (Sennybridge) towards the west 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 2om of drop, based on the 377m summit spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 357m 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 deletion of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 376.9m summit height and a 357.3m bwlch height, with these values giving this hill 19.6m 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:  Mynydd Trallwng 

OS 1:50,000 map:  160

Summit Height:  376.9m (LIDAR)                                                           

Summit Grid Reference:  SN 96522 31151 (LIDAR) 

Bwlch Height:  357.3m (LIDAR) 

Bwlch Grid Reference:  SN 96272 31300 & SN 96275 31303 (LIDAR) 

Drop:  19.6m (LIDAR) 

 

Myrddyn Phillips (June 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Lletwith (SN 865 405) – Sub-Trichant addition (232nd reclassification)

Significant Name Changes post for Lletwith

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 Lletwith (SN 865 405)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Lletwith and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north, west and east, and the A483 road farther to its north-west, and has the town of Llanymddfri (Llandovery) 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 22m of drop, based on the 335m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and the 313m 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 addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 335.3m summit height and a 310.7m bwlch height, with these values giving this hill 24.6m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lletwith 

OS 1:50,000 map:  147, 160

Summit Height:  335.3m (LIDAR)                                                           

Summit Grid Reference:  SN 86562 40517 & SN 86560 40522 & SN 86564 40525 (LIDAR) 

Bwlch Height:  310.7m (LIDAR) 

Bwlch Grid Reference:  SN 86110 40186 (LIDAR) 

Drop:  24.6m (LIDAR) 

 

Myrddyn Phillips (May 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Castell Craigyrwyddon (SN 844 366) – Sub-Trichant addition (231st 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 Castell Craigyrwyddon (SN 844 366)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Castell Craigyrwyddon, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the A483 road to its west, the A40 road to its south-west and minor roads to its south-east, and has the town of Llanymddfri (Llandovery) towards the west 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 21m of drop, based on the 355m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and the 334m 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 356.2m summit height and a 333.6m bwlch height, with these values giving this hill 22.6m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Castell Craigyrwyddon 

OS 1:50,000 map:  160

Summit Height:  356.2m (LIDAR)                                                           

Summit Grid Reference:  SN 84417 36643 (LIDAR) 

Bwlch Height:  333.6m (LIDAR) 

Bwlch Grid Reference:  SN 84395 36784 (LIDAR) 

Drop:  22.6m (LIDAR) 

 

Myrddyn Phillips (March 2024) 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Glan y Bronydd (SN 841 386) – Sub-Trichant addition (230th reclassification)

Significant Name Changes post for Glan y Bronydd

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 Glasn y Bronydd (SN 841 386)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Glan y Bronydd and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north and south south-east, the A483 road to its west and the A40 road to its south-west, and has the town of Llanymddfri (Llandovery) towards the west 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 an estimated c 353m summit height and an estimated c 333m bwlch height, with both heights based on interpolation of 10m contouring. 

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 354.9m summit height and a 333.9m bwlch height, with these values giving this hill 21.1m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Glan y Bronydd 

OS 1:50,000 map:  160

Summit Height:  354.9m (LIDAR)                                                           

Summit Grid Reference:  SN 84130 38630 (LIDAR) 

Bwlch Height:  333.9m (LIDAR) 

Bwlch Grid Reference:  SN 83968 38357 (LIDAR) 

Drop:  21.1m (LIDAR) 

 

Myrddyn Phillips (March 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Lan Fawr Cwmclyd (SN 834 377) – Sub-Trichant addition (229th reclassification) 

Significant Name Changes post for Lan Fawr Cwmclyd

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 conducted by Myrddyn Phillips. 

LIDAR image of Lan Fawr Cwmclyd (SN 834 377)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Lan Fawr Cwmclyd and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the A483 road to its north-west, and has the town of Llanymddfri (Llandovery) towards the west 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 19m of drop, based on an estimated c 372m summit height and the 353m 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 addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 373.0m summit height and a 352.8m bwlch height, with these values giving this hill 20.2m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lan Fawr Cwmclyd 

OS 1:50,000 map:  160

Summit Height:  373.0m (LIDAR)                                                           

Summit Grid Reference:  SN 83431 37781 (LIDAR) 

Bwlch Height:  352.8m (LIDAR) 

Bwlch Grid Reference:  SN 83567 37755 (LIDAR) 

Drop:  20.2m (LIDAR) 

 

Myrddyn Phillips (March 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Lan Pulput (SN 834 392) – Sub-Trichant addition (228th reclassification)

Significant Name Changes post for Lan Pulput

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 Lan Pulpit (SN 834 392)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Lan Pulput and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the A483 road to its north-west, and has the town of Llanymddyfri (Llandovery) 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 22m of drop, based on the 305m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map, and an estimated c 283m bwlch height, based on interpolation of 10m contouring between 280m – 290m. 

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 304.2m summit height and a 283.4m bwlch height, with these values giving this hill 20.9m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lan Pulput 

OS 1:50,000 map:  160

Summit Height:  304.2m (LIDAR)                                                           

Summit Grid Reference:  SN 83485 39206 (LIDAR) 

Bwlch Height:  283.4m (LIDAR) 

Bwlch Grid Reference:  SN 83885 39030 (LIDAR) 

Drop:  20.9m (LIDAR) 

 

Myrddyn Phillips (February 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Lan Esgair Goch (SN 854 401) – Sub-Trichant addition (227th reclassification)

Significant Name Changes post for Lan Esgair Goch

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 Lan Esgair Goch (SN 854 401)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Lan Esgair Goch and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north and the A483 road to its west, and has the town of Llanwrtyd towards the north 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 21m of drop, based on the 328m summit spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and the 307m 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 329.1m summit height and a 307.6m bwlch height, with these values giving this hill 21.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lan Esgair Goch 

OS 1:50,000 map:  147, 160

Summit Height:  329.1m (LIDAR)                                                           

Summit Grid Reference:  SN 85458 40143 (LIDAR) 

Bwlch Height:  307.6m (LIDAR) 

Bwlch Grid Reference:  SN 85229 40376 (LIDAR) 

Drop:  21.5m (LIDAR) 

 

Myrddyn Phillips (February 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Lan Brynffo (SN 851 408) – Sub-Trichant addition (226th reclassification)

Summit Relocations post for Lan Brynffo

Significant Name Changes post for Lan Brynffo

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 Lan Brynffo (SN 851 408)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Lan Brynffo and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north and west, and the A483 road farther to its north-west, and has the town of Llanwrtyd towards the north 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 338m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map, and an estimated c 313m bwlch height, based on interpolation of 10m contouring between 310m – 320m. 

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 338.0m summit height and a 311.9m bwlch height, with these values giving this hill 26.1m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Lan Brynffo 

OS 1:50,000 map:  147, 160

Summit Height:  338.0m (LIDAR)                                                           

Summit Grid Reference:  SN 85196 40863 (LIDAR) 

Bwlch Height:  311.9m (LIDAR) 

Bwlch Grid Reference:  SN 85003 40781 & SN 85003 40772 (LIDAR) 

Drop:  26.1m (LIDAR) 

 

Myrddyn Phillips (February 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Dorth Siwgr (SN 834 427) – Sub-Trichant reclassified to Trichant (225th reclassification)

Significant Name Changes post for Dorth Siwgr

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 Dorth Siwgr (SN 834 427)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Dorth Siwgr and this was derived from online sources, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the A483 road to its north-west and a minor road to its south, and has the town of Llanymddyfri (Llandovery) 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 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 27m of drop, based on an estimated c 323m summit height and an estimated c 296m bwlch height, with both heights 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

Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website there have been a number of 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 were 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, whilst others are current such as the interactive mapping on the Magic Maps and WalkLakes websites.

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 Ordnance Survey maps and for this hill it had a 326m summit spot height and when coupled with the c 296m estimated bwlch height; these values gave this hill an estimated c 30m of drop.  The 326m summit spot height also appears on the interactive mapping available on the Magic Maps website.

One of the resources recently available online is the mapping on the OS Maps website and the details for this hill were subsequently re-assessed against this mapping.  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 295m – 300m, with interpolation placing the height of the bwlch as an estimated c 297m, resulting in the drop value of this hill being amended to an estimated c 29m and its status changing from Trichant to Sub-Trichant. 

Extract from the interactive mapping that was hosted on the OS 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.

Therefore, the reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 325.6m summit height and a 295.2m bwlch height, with these values giving this hill 30.4m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Dorth Siwgr 

OS 1:50,000 map:  147, 160

Summit Height:  325.6m (LIDAR)                                                           

Summit Grid Reference:  SN 83481 42793 (LIDAR) 

Bwlch Height:  295.2m (LIDAR) 

Bwlch Grid Reference:  SN 83703 42851 (LIDAR) 

Drop:  30.4m (LIDAR) 

 

Myrddyn Phillips (February 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Cae Mawr (SN 832 405) – Trichant reclassified to Sub-Trichant (224th reclassification)

Significant Name Changes post for Cae 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 derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Cae Mawr (SN 832 405)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Cae Mawr and this was derived from the Tithe map, and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-west, the A483 road farther to its north-west and the A40 road to its south, and has the town of Llanymddyfri (Llandovery) 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 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 29m of drop, based on the 313m summit spot height and the 284m bwlch spot height 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

Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website there have been a number of 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 were 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, whilst others are current such as the interactive mapping on the Magic Maps and WalkLakes websites.

One of the resources recently available online is the mapping on the OS Maps website and the details for this hill were subsequently re-assessed against this mapping.  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 280m – 285m, with interpolation placing the height of the bwlch as an estimated c 283m, with this position favoured over that of the 284m spot height, resulting in its drop value being amended to an estimated c 30m and its status reclassified to a Trichant. 

Bwlch contouring extract from the OS 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.

Therefore, the reclassification of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 312.5m summit height and a 284.5m bwlch height, with these values giving this hill 28.0m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Epynt 

Name:  Cae Mawr 

OS 1:50,000 map:  147, 160

Summit Height:  312.5m (LIDAR)                                                           

Summit Grid Reference:  SN 83261 40541 (LIDAR) 

Bwlch Height:  284.5m (LIDAR) 

Bwlch Grid Reference:  SN 84050 41511 & SN 84048 41515 (LIDAR) 

Drop:  28.0m (LIDAR) 

 

Myrddyn Phillips (January 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Wstrws (SN 389 502) – Sub-Trichant addition (223rd reclassification)

Summit Relocations post for Wstrws

Significant Name Changes post for Wstrws

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 Wstrws (SN 389 502)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Wstrws and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the A486 road to its north-west and minor roads to its south and east, and has the village of Post-mawr (Synod Inn) towards the north 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 22m of drop, based on the 308m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map, and an estimated c 286m bwlch height, based on interpolation of 5m contouring between 285m – 290m. 

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 308.2m summit height and a 286.3m bwlch height, with these values giving this hill 21.9m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Wstrws 

OS 1:50,000 map:  145

Summit Height:  308.2m (LIDAR)                                                           

Summit Grid Reference:  SN 38955 50296 (LIDAR) 

Bwlch Height:  286.3m (LIDAR) 

Bwlch Grid Reference:  SN 38557 50449 (LIDAR) 

Drop:  21.9m (LIDAR) 

 

Myrddyn Phillips (January 2024)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Pen Moel Hedog (SN 451 469) – Sub-Trichant addition (222nd reclassification)

Summit Relocations post for Pen Moel Hedog

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 Pen Moel Hedog (SN 451 469)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Pen Moel Hedog, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4459 road to its west, the A475 road to its south and a minor road to its east, and has the town of Llanybydder towards the east south-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 23m of drop, based on the 314m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map, and an estimated c 291m bwlch height, based on interpolation of 5m contouring between 290m – 295m. 

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 312.8m summit height and a 289.8m 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:  Mynydd Bach 

Name:  Pen Moel Hedog 

OS 1:50,000 map:  146

Summit Height:  312.8m (LIDAR)                                                           

Summit Grid Reference:  SN 45159 46968 (LIDAR) 

Bwlch Height:  289.8m (LIDAR) 

Bwlch Grid Reference:  SN 45622 48279 (LIDAR) 

Drop:  23.0m (LIDAR) 

 

Myrddyn Phillips (January 2024)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Brynele (SN 570 609) – Sub-Trichant addition (221st reclassification)

Significant Name Changes post for Brynele

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 Brynele (SN 570 609)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Brynele and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north, west and south, with the B4576 road to its east, and has the village of Llangeitho towards the east south-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.

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 21m of drop, based on the 304m summit spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and the 283m 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 303.4m summit height and a 283.3m 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:  Mynydd Bach 

Name:  Brynele 

OS 1:50,000 map:  146

Summit Height:  303.4m (LIDAR)                                                           

Summit Grid Reference:  SN 57034 60907 (LIDAR) 

Bwlch Height:  283.3m (LIDAR) 

Bwlch Grid Reference:  SN 56637 60817 (LIDAR) 

Drop:  20.1m (LIDAR) 

 

Myrddyn Phillips (December 2023)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Pt. 329.7m (SN 591 630) – Sub-Trichant addition (220th reclassification)

Summit Relocations post for Pt. 329.7m

Significant Height Revisions post for Pt. 329.7m

There has been confirmation 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 Pt. 329.7m (SN 591 630)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The hill is being listed by the point (Pt. 329.7m) notation and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4576 road to its north-west, B4577 road to its south and a minor road to its east, and has the village of Llangeitho towards the south-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 an estimated c 20m of drop, based on an estimated c 327m summit height and an estimated c 307m bwlch height, with both heights based on interpolation of 5m contouring that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage map.

Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website there have been a number of 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 were 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, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites.

One of the mapping resources now available online is on the Magic Maps website which hosts an interactive map originated from Ordnance Survey data.  Until recently this mapping had many spot heights not on other publicly available maps and for this hill it had a 327m spot height on the summit area of this hill, resulting in its details being amended accordingly. 

Extract from the interactive mapping hosted on 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.

Another of the resources now available online is 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 maps and its 330m spot height matches the rounded up summit height that LIDAR gives this hill. 

Extract from the interactive mapping hosted on the WalkLakes website

Another resource now available online is the interactive mapping hosted on the Welsh Government website and entitled the DataMapWales.  This mapping has 5m contours and its detail matches that produced from the OS Terrain 5 product, which compliments much of that produced from LIDAR.  This map also has a 330m spot height which matches the rounded up figure produced by LIDAR. 

Extract from the DataMapWales

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 329.7m summit height and a 306.9m bwlch height, with these values giving this hill 22.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Pt. 329.7m 

OS 1:50,000 map:  146

Summit Height:  329.7m (LIDAR)                                                           

Summit Grid Reference:  SN 59108 63024 (LIDAR) 

Bwlch Height:  306.9m (LIDAR) 

Bwlch Grid Reference:  SN 59361 63409 & SN 59359 63413 (LIDAR) 

Drop:  22.8m (LIDAR) 

 

Myrddyn Phillips (November 2023)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Craig Fawr (SN 589 621) – Sub-Trichant addition (219th reclassification)

Significant Height Revisions post for Craig Fawr

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 Fawr (SN 589 621)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Craig Fawr, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned encircled by minor roads, with the B4577 road farther to its north, the B4576 road to its west, the B4342 road farther to its south-east and the B4578 road farther to its east, and has the village of Llangeitho towards the south-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 an estimated c 20m of drop, based on an estimated c 313m summit height and an estimated c 293m bwlch height, with both heights based on interpolation of 5m contouring that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.

Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website there have been a number of 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 were 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, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites.

One of the mapping resources now available online is the Magic Maps website which hosts an interactive map originated from Ordnance Survey data.  This mapping had a 315m spot height on the summit area of this hill, resulting in its drop value being amended to an estimated c 22m. 

Extract from the interactive mapping hosted on 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.

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 315.2m summit height and a 293.0m bwlch height, with these values giving this hill 22.2m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Craig Fawr 

OS 1:50,000 map:  146

Summit Height:  315.2m (LIDAR)                                                           

Summit Grid Reference:  SN 58922 62145 (LIDAR) 

Bwlch Height:  293.0m (LIDAR) 

Bwlch Grid Reference:  SN 58953 62291 (LIDAR) 

Drop:  22.2m (LIDAR) 

 

Myrddyn Phillips (November 2023)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Pt. 314.9m (SN 607 632) – Sub-Trichant addition (218th reclassification)

There has been confirmation 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 Pt. 314.9m (SN 607 632)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The hill is being listed by the point (Pt. 314.9m) notation and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and north-west, and the B4577 road to its south, and has the town of Tregaron towards the east south-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 an estimated c 20m of drop, based on the 314m 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 latterly the interactive mapping on the WalkLakes website and an estimated c 294m bwlch height, based on interpolation of 10m contouring between 290m – 300m. 

Extract from the interactive mapping hosted on the WalkLakes 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.

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 314.9m summit height and a 293.9m bwlch height, with these values giving this hill 21.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Pt. 314.9m 

OS 1:50,000 map:  146

Summit Height:  314.9m (LIDAR)                                                           

Summit Grid Reference:  SN 60754 63242 (LIDAR) 

Bwlch Height:  293.9m (LIDAR) 

Bwlch Grid Reference:  SN 60530 63206 (LIDAR) 

Drop:  21.0m (LIDAR) 

 

Myrddyn Phillips (November 2023)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Bryndu Goed (SN 636 697) – Sub-Trichant addition (217th reclassification)

Significant Name Changes post for Bryndu Goed

There has been confirmation 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 Bryndu Goed (SN 636 697)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Bryndu Goed and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north, west and south, the B4576 road farther to its west and the A485 road to its east, and has the village of Lledrod 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 21m of drop, based on the 306m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 285m bwlch height, based on interpolation of 10m contouring between 280m – 290m. 

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 307.5m summit height and a 286.0m bwlch height, with these values giving this hill 21.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Bryndu Goed 

OS 1:50,000 map:  135

Summit Height:  307.5m (LIDAR)                                                           

Summit Grid Reference:  SN 63610 69707 (LIDAR) 

Bwlch Height:  286.0m (LIDAR) 

Bwlch Grid Reference:  SN 63529 69738 (LIDAR) 

Drop:  21.5m (LIDAR) 

 

Myrddyn Phillips (November 2023)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Esgair Hyddod (SN 617 685) – Sub-Trichant addition (216th reclassification)

Significant Name Changes post for Esgair Hyddod

There has been confirmation 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 Esgair Hyddod (SN 617 685) 

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Esgair Hyddod and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north, west and south, the B4576 road farther to its west and the A485 road to its east, and has the village of Lledrod 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 22m of drop, based on the 357m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 335m 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 357.2m summit height and a 335.3m bwlch height, with these values giving this hill 21.9m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Esgair Hyddod 

OS 1:50,000 map:  135

Summit Height:  357.2m (LIDAR)                                                           

Summit Grid Reference:  SN 61718 68531 (LIDAR) 

Bwlch Height:  335.3m (LIDAR) 

Bwlch Grid Reference:  SN 61608 68135 & SN 61610 68135 (LIDAR) 

Drop:  21.9m (LIDAR) 

 

Myrddyn Phillips (October 2023)

  

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Comin Mynydd Bach (SN 617 675) – Sub-Trichant addition (215th reclassification)

Significant Name Changes post for Comin Mynydd Bach

There has been confirmation 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 Comin Mynydd Bach (SN 617 675)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is now listed by is Comin Mynydd Bach and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its west and south, the B4576 road farther to its west and the A485 road to its east, and has the village of Lledrod 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 29m of drop, based on an estimated c 360m summit height interpolated from the uppermost 360m contour ring that appears on the Ordnance Survey 1:25,000 Explorer map and the 331m 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 360.45m summit height and a 330.6m bwlch height, with these values giving this hill 29.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Comin Mynydd Bach 

OS 1:50,000 map:  135

Summit Height:  360.45m (LIDAR)                                                           

Summit Grid Reference:  SN 61733 67595 (LIDAR) 

Bwlch Height:  330.6m (LIDAR) 

Bwlch Grid Reference:  SN 61271 68238 (LIDAR) 

Drop:  29.8m (LIDAR) 

 

Myrddyn Phillips (October 2023)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Craig y Bwlch (SN 718 696) – Sub-Trichant reclassified to Trichant (214th reclassification)

Significant Height Revisions post for Craig y Bwlch

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 Craig y Bwlch (SN 718 696)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Craig y Bwlch, and it is adjoined to the Carn yr Hyrddod group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4340 road to its west, a minor road to its south-east and the B4343 road to its east, and has the village of Ysbyty Ystwyth 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 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, with an accompanying note stating; Automatically qualified until the top was quarried away.  350c on 1986 1:50000 map. 

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 an estimated c 27m of drop, based on an estimated c 342m summit height and an estimated c 315m bwlch height, with both heights based on interpolation of 10m contouring that appears on 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 reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 350.3m summit height and a 312.0m bwlch height, with these values giving this hill 38.3m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod 

Name:  Craig y Bwlch 

OS 1:50,000 map:  135, 147

Summit Height:  350.3m (LIDAR)                                                           

Summit Grid Reference:  SN 71860 69685 (LIDAR) 

Bwlch Height:  312.0m (LIDAR) 

Bwlch Grid Reference:  SN 71462 69797 (LIDAR) 

Drop:  38.3m (LIDAR) 

 

Myrddyn Phillips (October 2023)

 

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Pen y Bwlch Coch (SH 751 159) – Sub-Trichant reclassified to Trichant (213th 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 produced by JoeNuttall in his surface analysis progamme, with subsequent LIDAR analysis conducted by the DoBIH team and independently by Myrddyn Phillips. 

LIDAR image of Pen y Bwlch Coch (SH 751 159)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Pen y Bwlch Coch, and it is adjoined to the Cadair Idris group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A470 road to its north and the A487 road to its east, and has the town of Dolgellau towards the north-west.

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 main P30 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 26m of drop, based on the 395m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and the 369m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website which was entitled the Interactive Coverage Map, however it was noted that the latter spot height was not centralised where interpolation would place the critical point of the bwlch. 

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

One of the resources recently available online is the mapping on the OS Maps website and the details for this hill were subsequently re-assessed against this mapping.  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 365m – 370m, with interpolation placing the height of the bwlch as an estimated c 366m, and when coupled with the 395m summit spot height these values gave this hill an estimated c 29m 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 from Sub-Trichant status is due to LIDAR analysis, resulting in a 395.1m summit height and a 364.9m 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:  Cadair Idris 

Name:  Pen y Bwlch Coch 

OS 1:50,000 map:  124

Summit Height:  395.1m (LIDAR)                                                           

Summit Grid Reference:  SH 75190 15937 (LIDAR) 

Bwlch Height:  364.9m (LIDAR) 

Bwlch Grid Reference:  SH 75107 15780 (LIDAR) 

Drop:  30.2m (LIDAR) 

 

Myrddyn Phillips (September 2023)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Mynydd Fforest (SO 094 395) – Trichant addition (212th 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 produced by Joe Nuttall in his surface analysis progamme, with subsequent LIDAR analysis conducted by the DoBIH team and independently by Aled Williams and Myrddyn Phillips. 

Mynydd Fforest (SO 094 395)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Mynydd Fforest and it is adjoined to the Mynydd Epynt group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its west, south and north-east, with the A470 road farther to its east, and has the village of Erwyd (Erwood) 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 as with a summit height of 400m, based on the spot height adjoined to the triangulation pillar that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map it was included in the 400m height band of Welsh P30 hills that are now known as the Y Pedwarau – The 400m Hills of Wales. 

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 an estimated c 63m of drop, based on the 400m summit spot height and an estimated c 337m bwlch height, based on interpolation of 10m contouring between 330m – 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. 

LIDAR image of Mynydd Fforest (SO 094 395)

Therefore, the addition of this hill to Trichant status is due to LIDAR analysis, resulting in a 399.8m summit height and a 334.9m bwlch height, with these values giving this hill 65.0m of drop, with its height now sufficient for it to be classified as a Trichant. 

 

The full details for the hill are:

Group:  Mynydd Epynt 

Name:  Mynydd Fforest 

OS 1:50,000 map:  161

Summit Height:  399.8m (LIDAR) 

Summit Grid Reference:  SO 09495 39530 (LIDAR) 

Bwlch Height:  334.9m (LIDAR) 

Bwlch Grid Reference:  SO 07943 38253 (LIDAR) 

Drop:  65.0m (LIDAR) 

 

Myrddyn Phillips (August 2023)

Mapping Mountains - Hill Reclassifications - Y Trichant - The 300m Hills of Wales

Coed Llwyn Owen (SN 703 403) – Sub-Trichant addition (211th 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 13^th May 2017, and the Introduction to the Mapping Mountains publication of the list appearing on the 1^st January 2022. 

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

The name the hill is listed by is Coed Llwyn Owen and it is adjoined to the Mynydd Mallaen group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its and south and the A482 road farther to its south-west, and has the town of Llanymddyfri (Llandovery) towards the south-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 an estimated c 20m of drop, based on the 346m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 326m bwlch height, based on interpolation of 10m contouring between 320m – 330m.

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 346m summit height and an estimated c 326m 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:  Mynydd Mallaen 

Name:  Coed Llwyn Owen 

OS 1:50,000 map:  146, 147, 160

Summit Height:  346m (spot height)                                                           

Summit Grid Reference:  SN 70382 40319 (spot height) 

Bwlch Height:  c 326m (interpolation) 

Bwlch Grid Reference:  SN 70439 40313 (interpolation) 

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

 

Myrddyn Phillips (July 2023)