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

Pt. 328m (SN 676 358) – Sub-Trichant addition (210th 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 hill is being listed by the point (Pt. 328m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the 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 minor roads to its north and south, the B4302 road to its north-west, and the A482 farther to its east, and has the town of Llanymddyfri (Llandovery) 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 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 328m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 308m bwlch height, based on interpolation of 10m contouring between 300m – 310m.

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 328m summit height and an estimated c 308m 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:  Pt. 328m 

OS 1:50,000 map:  146

Summit Height:  328m (spot height)                                                           

Summit Grid Reference:  SN 67676 35870 (spot height) 

Bwlch Height:  c 308m (interpolation) 

Bwlch Grid Reference:  SN 68426 35513 (interpolation) 

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

 

Myrddyn Phillips (July 2023)

 

 

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

Pigyn Shôn Nicolas (SN 667 354) – Sub-Trichant addition (209th 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 Pigyn Shôn Nicolas, 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 minor roads to its north, west and south-east, and the B4302 road to its north-west, and has the town of Llanymddyfri (Llandovery) 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 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 the 322m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map at SN 66753 35404 and SN 66689 34767 and an estimated c 303m bwlch height, based on interpolation of 10m contouring between 300m – 310m. 

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.  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.  Although the mapping on the OS Maps website no longer has contours at 5m intervals, such contours are represented on other mapping available online and for this hill this mapping has bwlch contouring between 300m – 305m, with interpolation placing the height of the bwlch as an estimated c 301m. 

Interactive map with 5m contouring available online

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 322m summit height and an estimated c 301m bwlch height, with these values giving this hill an estimated c 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Mynydd Mallaen 

Name:  Pigyn Shôn Nicolas 

OS 1:50,000 map:  146

Summit Height:  322m (spot height)                                                           

Summit Grid Reference:  SN 66753 35404 & SN 66689 34767 (spot height) 

Bwlch Height:  c 301m (interpolation) 

Bwlch Grid Reference:  SN 67137 35439 (interpolation) 

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

 

Myrddyn Phillips (June 2023)

 

 

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

Hafod Tafolog (SN 704 364) – Sub-Trichant addition (208th reclassification)

Significant Name Changes post for Hafod Tafolog

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 Hafod Tafolog and this was derived from the Tithe map, 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 minor roads to its north, west, south and east, and the A482 road farther to its west, and has the town of Llanymddyfri (Llandovery) 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 20m of drop, based on the 326m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 306m 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.

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 336m summit height and a 306m bwlch height, with these values giving this hill 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:  Hafod Tafolog 

OS 1:50,000 map:  146, 160

Summit Height:  326m (spot height)                                                           

Summit Grid Reference:  SN 70475 36417 (spot height) 

Bwlch Height:  306m (spot height) 

Bwlch Grid Reference:  SN 70473 36526 (spot height) 

Drop:  2om (spot height summit and bwlch) 

 

Myrddyn Phillips (June 2023)

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

Pt. 344.1m (SN 662 471) – Sub-Trichant addition (207th 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 LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Pt. 344.1m (SN 662 471)

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. 344.1m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Esgair Wen 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 B4343 road farther to its north-west and the A482 road farther to its south-west, and has the town of Llanbedr Pont Steffan (Lampeter) 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 an estimated c 17m of drop, based on the 345m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 328m 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 addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 344.1m summit height and a 323.3m bwlch height, with these values giving this hill 20.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Esgair Wen 

Name:  Pt. 344.1m 

OS 1:50,000 map:  146

Summit Height:  344.1m (LIDAR)                                                           

Summit Grid Reference:  SN 66219 47125 (LIDAR) 

Bwlch Height:  323.3m (LIDAR) 

Bwlch Grid Reference:  SN 66507 47197 (LIDAR) 

Drop:  20.8m (LIDAR) 

 

Myrddyn Phillips (May 2023)

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

Pant y Crug (SN 657 458) – Sub-Trichant reclassified to Trichant (206th reclassification)

Significant Name Changes post for Pant y Crug

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 Pant y Crug (SN 657 458)

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 Pant y Crug and this was derived from the Tithe map, and it is adjoined to the Esgair Wen 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, south and east, and the A482 road farther to its south-west, and has the town of Llanbedr Pont Steffan (Lampeter) towards the west 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.

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 25m of drop, based on the 334m twin summit spot heights that appear on the Ordnance Survey 1:25,000 Explorer map and the 309m 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 reclassification of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 334.4m summit height and a 304.3m bwlch height, with these values giving this hill 30.1m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Esgair Wen 

Name:  Pant y Crug 

OS 1:50,000 map:  146

Summit Height:  334.4m (LIDAR)                                                           

Summit Grid Reference:  SN 65795 45897 (LIDAR) 

Bwlch Height:  304.3m (LIDAR) 

Bwlch Grid Reference:  SN 66317 46159 (LIDAR) 

Drop:  30.1m (LIDAR) 

 

Myrddyn Phillips (May 2023)

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

Pt. 383m (SN 643 476) – Sub-Trichant addition (205th 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 and LIDAR analysis conducted by Myrddyn Phillips. 

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. 383m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Esgair Wen group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned enclosed by minor roads, with the B4343 road farther to its north-west and the A482 road farther to its south-west, and has the town of Llanbedr Pont Steffan (Lampeter) 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 18m of drop, based on the 383m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 365m 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 detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 383m summit height and a 361.9m bwlch height, with these values giving this hill 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Esgair Wen 

Name:  Pt. 383m 

OS 1:50,000 map:  146

Summit Height:  383m (spot height)                                                           

Summit Grid Reference:  SN 64358 47680 (spot height) 

Bwlch Height:  361.9m (LIDAR) 

Bwlch Grid Reference:  SN 64555 47855 (LIDAR) 

Drop:  21m (spot height summit and LIDAR bwlch) 

 

Myrddyn Phillips (May 2023)

 

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

Allt Bryn Teg (SN 681 436) – Sub-Trichant addition (204th 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 Allt Bryn Teg, and it is adjoined to the Esgair Wen 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 south-east, and the A482 road farther to the south-west, and has the town of Llanbedr Pont Steffan (Lampeter) towards the west 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 21m of drop, based on the 302m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 281m bwlch height, based on interpolation of 10m contouring between 280m – 290m. 

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

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 302m summit height and an estimated c 281m bwlch height, with these values giving this hill an estimated c 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Esgair Wen 

Name:  Allt Bryn Teg 

OS 1:50,000 map:  146

Summit Height:  302m (spot height)                                                           

Summit Grid Reference:  SN 68148 43641 (spot height) 

Bwlch Height:  c 281m (interpolation) 

Bwlch Grid Reference:  SN 68127 43826 (interpolation) 

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

 

Myrddyn Phillips (April 2023)

 

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

Bryn Cysegrfa (SN 643 521) – Sub-Trichant deletion (203rd reclassification)

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

LIDAR image of Bryn Cysegrfa (SN 643 521)

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 Bryn Cysegrfa, and it is adjoined to the Esgair Wen group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4343 road to its north-west and minor roads to its south-west and east, and has the town of Llanbedr Pont Steffan (Lampeter) towards the south-west.

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 20m of drop, based on the 337m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 317m 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 deletion of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 338.3m summit height and a 318.8m bwlch height, with these values giving this hill 19.5m of drop, which is insufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Esgair Wen 

Name:  Bryn Cysegrfa 

OS 1:50,000 map:  146

Summit Height:  338.3m (LIDAR)                                                           

Summit Grid Reference:  SN 64313 52109 (LIDAR) 

Bwlch Height:  318.8m (LIDAR) 

Bwlch Grid Reference:  SN 64689 52334 (LIDAR) 

Drop:  19.5m (LIDAR) 

 

Myrddyn Phillips (April 2023)

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

Dyrys Du (SN 803 509) – Sub-Trichant addition (202nd 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 Dyrys Du, and it is adjoined to the Esgair Wen 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 surrounded by Llyn Brianne to its west, south and east, and has the village of Beulah 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 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 399m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 379m bwlch height, based on interpolation of 10m contouring between 370m – 380m. 

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

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 399m summit height and an estimated c 379m 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:  Esgair Wen 

Name:  Dyrys Du 

OS 1:50,000 map:  147

Summit Height:  399m (spot height)                                                           

Summit Grid Reference:  SN 80303 50936 (spot height) 

Bwlch Height:  c 379m (interpolation) 

Bwlch Grid Reference:  SN 80131 51190 (interpolation) 

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

 

Myrddyn Phillips (April 2023)

  

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

Lan Ganol (SN 973 571) – Sub-Trichant addition (201st reclassification)

Survey post for Lan Ganol

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 a Trimble GeoXH 6000 survey and LIDAR analysis conducted by Myrddyn Phillips. 

Lan Ganol (SN 973 571)

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 Lan Ganol, and it is adjoined to the Drygarn Fawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4358 road to its south-east, and has the village of Newbridge-on-Wye towards the east north-east.

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was 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 24m of drop, based on the 377m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map 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.

However, it was not until the survey with the Trimble GeoXH 6000 coupled with LIDAR analysis 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 Lan Ganol (SN 973 571)

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to a Trimble GeoXH 6000 survey and LIDAR analysis, resulting in a 375.3m summit height and a 351.8m bwlch height, with these values giving this hill 23.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Drygarn Fawr 

Name:  Lan Ganol 

OS 1:50,000 map:  147

Summit Height:  375.3m (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference:  SN 97371 57189 (Trimble GeoXH 6000) 

Bwlch Height:  351.8m (LIDAR) 

Bwlch Grid Reference:  SN 97732 57107 (LIDAR) 

Drop:  23.5m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

Myrddyn Phillips (April 2023)

 

 

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

Cnuach Twndwn (SN 704 622) – Sub-Trichant addition (200th reclassification)

Significant Name Changes post for Cnuach Twndwn

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 Cnuach Twndwn (SN 704 622)

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 Cnuach Twndwn, and this was derived from the Tithe map, and it is adjoined to the Esgair Wen group of hills, which are situated in the central part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4343 road to its west and a minor road to its south, and has the town of Tregaron 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 20m of drop, based on the 311m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 291m 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 310.3m summit height and a 290.2m 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:  Esgair Wen 

Name:  Cnuach Twndwn 

OS 1:50,000 map:  146, 147

Summit Height:  310.3m (LIDAR)                                                           

Summit Grid Reference:  SN 70475 62297 (LIDAR) 

Bwlch Height:  290.2m (LIDAR) 

Bwlch Grid Reference:  SN 70717 62333 (LIDAR) 

Drop:  20.1m (LIDAR) 

 

Myrddyn Phillips (March 2023)

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

Bryn (SN 886 529) – Sub-Trichant addition (199th reclassification)

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

LIDAR image of Bryn (SN 886 529)

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 Bryn, and it is adjoined to the Drygarn Fawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-west and east, and the A483 road to its south-east, and has the village of Beulah 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 22m of drop, based on the 348m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 326m 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 347.1m summit height and a 325.3m bwlch height, with these values giving this hill 21.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Drgarn Fawr 

Name:  Bryn 

OS 1:50,000 map:  147

Summit Height:  347.1m (LIDAR)                                                           

Summit Grid Reference:  SN 88693 52957 (LIDAR) 

Bwlch Height:  325.3m (LIDAR) 

Bwlch Grid Reference:  SN 88395 52871 (LIDAR) 

Drop:  21.8m (LIDAR) 

 

Myrddyn Phillips (March 2023)

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

Lan Fach (SN 956 543) – Sub-Trichant addition (198th 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 Lan Fach (SN 956 543)

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 Lan Fach, and it is adjoined to the Drygarn Fawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north and west, and the B4358 road to its east, and has the village of Beulah 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 25m of drop, based on the 318m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 293m 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 317.1m summit height and a 292.6m bwlch height, with these values giving this hill 24.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Drgarn Fawr 

Name:  Lan Fach 

OS 1:50,000 map:  147

Summit Height:  317.1m (LIDAR)                                                           

Summit Grid Reference:  SN 95649 54379 (LIDAR) 

Bwlch Height:  292.6m (LIDAR) 

Bwlch Grid Reference:  SN 95515 54418 (LIDAR) 

Drop:  24.5m (LIDAR) 

 

Myrddyn Phillips (March 2023)

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

Wennallt (SN 953 529) – Sub-Trichant addition (197th 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 Wennallt (SN 953 529)

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 Wennallt, and it is adjoined to the Drygarn Fawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4358 road to its north and minor roads to its west, south and east, and has the village of Beulah 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 26m of drop, based on the 319m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 293m bwlch height, based on interpolation of 10m contouring between 290m – 300m. 

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 318.0m summit height and a 291.9m 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:  Drgarn Fawr 

Name:  Wennallt 

OS 1:50,000 map:  147

Summit Height:  318.0m (LIDAR)                                                           

Summit Grid Reference:  SN 95351 52975 (LIDAR) 

Bwlch Height:  291.9m (LIDAR) 

Bwlch Grid Reference:  SN 95489 53311 (LIDAR) 

Drop:  26.1m (LIDAR) 

 

Myrddyn Phillips (March 2023)

 

 

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

Drysgol (SN 708 695) – Sub-Trichant addition (196th 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 detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR bwlch image of Drysgol (summit at SN 708 695)

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 Drysgol, 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 a minor road to its north, the B4340 road to its west and south, and the B4343 road to its east, and has the village of Pontrhydfendigaid 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.

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 348m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 327m bwlch height, based on interpolation of 10m contouring between 320m – 330m. 

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

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

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 348m summit height and a 324.0m bwlch height, with these values giving this hill 24m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod 

Name:  Drysgol 

OS 1:50,000 map:  135, 147

Summit Height:  348m (spot height)                                                           

Summit Grid Reference:  SN 70874 69588 (spot height) 

Bwlch Height:  324.0m (LIDAR) 

Bwlch Grid Reference:  SN 70800 69867 & SN 70800 69869 (LIDAR) 

Drop:  24m (spot height summit and LIDAR bwlch) 

 

Myrddyn Phillips (February 2023)

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

Cae Glog Fawr (SN 750 716) – Sub-Trichant addition (195th reclassification)

Significant Name Changes post for Cae Glog Fawr

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 Cae Glog Fawr (SN 750 716)

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 Cae Glog Fawr and this was derived from the Tithe map, 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 minor roads to its north, west and south, and the B4343 road farther to its north-west, and has the village of Pont-rhyd-y-groes 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 19m of drop, based on an estimated c 362m summit height and an estimated c 343m 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 addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 361.7m summit height and a 341.4m bwlch height, with these values giving this hill 20.3m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod 

Name:  Cae Glog Fawr 

OS 1:50,000 map:  135, 147

Summit Height:  361.7m (LIDAR)                                                           

Summit Grid Reference:  SN 75034 71676 (LIDAR) 

Bwlch Height:  341.4m (LIDAR) 

Bwlch Grid Reference:  SN 75436 71630 (LIDAR) 

Drop:  20.3m (LIDAR) 

 

Myrddyn Phillips (February 2023)

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

Bryn (SN 761 721) – Sub-Trichant addition (194th reclassification)

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

LIDAR image of Bryn (SN 761 721)

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 Bryn, 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 B4574 road to its north, and a minor road to its west, and has the village of Pont-rhyd-y-groes towards the west 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 22m of drop, based on the 374m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 352m 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 374.4m summit height and a 351.3m bwlch height, with these values giving this hill 23.1m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod 

Name:  Bryn 

OS 1:50,000 map:  135, 147

Summit Height:  374.4m (LIDAR)                                                           

Summit Grid Reference:  SN 76151 72170 (LIDAR) 

Bwlch Height:  351.3m (LIDAR) 

Bwlch Grid Reference:  SN 76391 71640 (LIDAR) 

Drop:  23.1m (LIDAR) 

 

Myrddyn Phillips (February 2023)

 

 

 

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

Pt. 318.8m (SN 710 768) – Sub-Trichant addition (193rd reclassification)

Significant Name Changes post for Pt. 318.8m

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 Pt. 318.8m (SN 710 768)

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

The hill is being listed by the point (Pt. 318.8m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Y Garn group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A4120 road to its north, and minor roads to its west and south, and has the village of Pontarfynach (Devil’s Bridge) 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 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 319m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 294m bwlch height based on interpolation of 10m contouring between 290m – 300m. 

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 318.8m summit height and a 293.3m bwlch height, with these values giving this hill 25.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Y Garn 

Name:  Pt. 318.8m 

OS 1:50,000 map:  135, 147

Summit Height:  318.8m (LIDAR)                                                           

Summit Grid Reference:  SN 71015 76877 (LIDAR) 

Bwlch Height:  293.3m (LIDAR) 

Bwlch Grid Reference:  SN 70554 76787 (LIDAR) 

Drop:  25.5m (LIDAR) 

 

Myrddyn Phillips (February 2023)

 

 

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

Allt Ddu (SN 714 776) – Sub-Trichant addition (192nd 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 Allt Ddu (SN 714 776)

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 Allt Ddu, and it is adjoined to the Y Garn group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and the A4120 road to its south, and has the village of Pontarfynach (Devil’s Bridge) 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 22m of drop, based on the 323m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 301m bwlch height based on interpolation of 10m contouring between 300m – 310m. 

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

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

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 324.1m summit height and a 300.3m bwlch height, with these values giving this hill 23.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Y Garn 

Name:  Allt Ddu 

OS 1:50,000 map:  135, 147

Summit Height:  324.1m (LIDAR)                                                           

Summit Grid Reference:  SN 71425 77687 (LIDAR) 

Bwlch Height:  300.3m (LIDAR) 

Bwlch Grid Reference:  SN 70947 77718 (LIDAR) 

Drop:  23.8m (LIDAR) 

 

Myrddyn Phillips (February 2023)

 

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

Banc y Bont (SN 750 758) – Sub-Trichant addition (191st 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 LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Banc y Bont (SN 750 758)

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 Banc y Bont, and it is adjoined to the Y Garn group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the B4574 road to its north, the B4343 road to its west and the B4574 road to its south, and has the village of Pontarfynach (Devil’s Bridge) 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 19m of drop, based on the 382m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 363m bwlch height based on interpolation of 10m contouring between 360m – 370m. 

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

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 also had a 382m summit spot height. 

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 addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 382.3m summit height and a 362.15m 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:  Y Garn 

Name:  Banc y Bont 

OS 1:50,000 map:  135, 147

Summit Height:  382.3m (LIDAR)                                                           

Summit Grid Reference:  SN 75022 75857 & SN 75024 75858 (LIDAR) 

Bwlch Height:  362.15m (LIDAR) 

Bwlch Grid Reference:  SN 75080 75718 (LIDAR) 

Drop:  20.1m (LIDAR) 

 

Myrddyn Phillips (February 2023)

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

Cefn Cwm Brwyno (SN 716 810) – Sub-Trichant addition (190th 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 Cefn Cwm Brwyno, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A44 road to its north and a minor road to its south, and has the village of Ponterwyd 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 Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 24m of drop, based on the 365m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 341m bwlch height, based on interpolation of 10m contouring between 340m – 350m. 

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

One of the mapping 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 the 365m spot height is also given on the summit area of this hill. 

Extract from the interactive mapping hosted on the WalkLakes website

Another of the mapping resources now available online is the Magic Maps website which hosts an interactive map originated from Ordnance Survey data.  This mapping also showed a 365m spot height on the summit area of this hill. 

Extract from the interactive mapping hosted on the Magic Maps website

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 365m summit height and an estimated c 341m bwlch height, with these values giving this hill as estimated c 24m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Cefn Cwm Brwyno 

OS 1:50,000 map:  135

Summit Height:  365m (spot height)                                                           

Summit Grid Reference:  SN 71662 81007 (spot height) 

Bwlch Height:  c 341m (interpolation) 

Bwlch Grid Reference:  SN 71773 80790 (interpolation) 

Drop:  c 24m (spot height summit and interpolated bwlch) 

 

Myrddyn Phillips (January 2023)

 

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

Banc Craignant Mawr (SN 736 821) – Sub-Trichant addition (189th 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 Banc Craignant Mawr, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and the A44 road to its south, and has the village of Ponterwyd 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.

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 388m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 366m bwlch height, based on interpolation of 10m contouring between 360m – 370m. 

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.  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.  Although the mapping on the OS Maps website no longer has contours at 5m intervals, such contours are represented on other mapping available online and for this hill this mapping has bwlch contouring between 360m – 365m, with interpolation placing the height of the bwlch as an estimated c 363m. 

Extract from online 5m contouring

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 388m summit height and an estimated c 363m bwlch height, with these values giving this hill as estimated c 25m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Banc Craignant Mawr 

OS 1:50,000 map:  135

Summit Height:  388m (spot height)                                                           

Summit Grid Reference:  SN 73684 82118 (spot height) 

Bwlch Height:  c 363m (interpolation) 

Bwlch Grid Reference:  SN 73528 82181 (interpolation) 

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

 

Myrddyn Phillips (January 2023)

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

Esgair Nant y Moch (SN 732 827) – Sub-Trichant addition (188th 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 Esgair Nant y Moch, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and the A44 road to its south, and has the village of Ponterwyd 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.

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 377m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 354m bwlch height, based on interpolation of 10m contouring between 350m – 360m. 

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 bwlch contouring between 350m – 355m, with interpolation placing the height of the bwlch as an estimated c 353m, with these contours also represented on other 5m contouring available online. 

Extract from online 5m contouring

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 377m summit height and an estimated c 353m bwlch height, with these values giving this hill as estimated c 24m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Esgair Nant y Moch 

OS 1:50,000 map:  135

Summit Height:  377m (spot height)                                                           

Summit Grid Reference:  SN 73201 82748 (spot height) 

Bwlch Height:  c 353m (interpolation) 

Bwlch Grid Reference:  SN 73048 82620 (interpolation) 

Drop:  c 24m (spot height summit and interpolated bwlch) 

 

Myrddyn Phillips (January 2023)

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

Esgair Nant y Moch (SN 728 826) – Sub-Trichant addition (187th reclassification)

Significant Name Changes post for Esgair Nant y Moch

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 Esgair Nant y Moch, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and the A44 road to its south, and has the village of Ponterwyd 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.

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 the 383m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 364m bwlch height, based on interpolation of 10m contouring between 360m – 370m. 

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 bwlch contouring between 360m – 365m, with interpolation placing the height of the bwlch as an estimated c 362m, with these contours also represented on other 5m contouring available online. 

Extract from online 5m contouring

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 383m summit height and an estimated c 362m bwlch height, with these values giving this hill as estimated c 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Esgair Nant y Moch 

OS 1:50,000 map:  135

Summit Height:  383m (spot height)                                                           

Summit Grid Reference:  SN 72835 82612 (spot height) 

Bwlch Height:  c 362m (interpolation) 

Bwlch Grid Reference:  SN 72614 82524 (interpolation) 

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

 

Myrddyn Phillips (January 2023)

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

Pt. 323m (SN 704 822) – Sub-Trichant addition (186th reclassification)

Significant Name Changes post for Pt. 323m

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 hill is being listed by the point (Pt. 323m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-west  and the A44 road to its south, and has the village of Ponterwyd 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 21m of drop, based on the 323m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 302m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  With the caveat that the 302m bwlch spot height was noted as being ‘not centred’. 

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 bwlch contouring between 300m – 305m, with interpolation placing the height of the bwlch as an estimated c 303m, with these contours also represented on other 5m contouring available online.

Extract from 5m contour online mapping

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 323m summit height and an estimated c 303m bwlch height, with these values giving this hill as 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:  Banc Llechwedd Mawr 

Name:  Pt. 323m 

OS 1:50,000 map:  135

Summit Height:  323m (spot height)                                                           

Summit Grid Reference:  SN 70430 82201 (spot height) 

Bwlch Height:  c 303m (interpolation) 

Bwlch Grid Reference:  SN 70650 82212 (interpolation) 

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

 

Myrddyn Phillips (December 2022)

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

Pt. 387.4m (SN 746 843) – Sub-Trichant deletion (185th reclassification)

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

LIDAR image of Pt. 387.4m (SN 746 843)

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 hill is being listed by the point (Pt. 387.4m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north, south-west and east, and the A44 road farther to its south, and has the village of Ponterwyd towards the south.

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 386m summit spot height that appears on the Ordnance Survey 1:25,ooo Explorer map (with the contemporary Ordnance Survey online 1:50,000 Landranger map showing a typo of 336m) and an estimated c 366m bwlch height based on interpolation of 10m contouring between 360m – 370m. 

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 387.4m summit height and a 368.8m bwlch height, with these values giving this hill 18.7m of drop, which is insufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Pt. 387.4m 

OS 1:50,000 map:  135

Summit Height:  387.4m (LIDAR)                                                           

Summit Grid Reference:  SN 74678 84375 (LIDAR) 

Bwlch Height:  368.8m (LIDAR) 

Bwlch Grid Reference:  SN 74599 84483 (LIDAR) 

Drop:  18.7m (LIDAR) 

 

Myrddyn Phillips (December 2022)

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

Cefn Coch (SN 747 962) – Sub-Trichant reclassified to 200m Sub-Twmpau (184th reclassification)

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

LIDAR image of Cefn Coch (SN 747 962)

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

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

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

The 200m Twmpau by Myrddyn Phillips

The name the hill is listed by is Cefn Coch, and it is adjoined to the Banc Llechwedd Mawr group of hills which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A487 road to its west and a minor roads to its east, and has the town of Machynlleth towards the north.

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list with an estimated summit height of c 300m based on interpolation of the uppermost ring contour that appears on the Ordnance Survey 1:25,000 Explorer map, with an accompanying note stating; Three points of same height, indicating three separate 300m ring contours. 

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 reclassification of this hill is due to LIDAR analysis, resulting in 24.6m of drop, with a 299.7m summit height and a 275.1m bwlch height.  Therefore, as the summit height is insufficient for Sub-Trichant status the hill is reclassified to a 200m Sub-Twmpau. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Cefn Coch 

OS 1:50,000 map:  135

Summit Height:  299.7m (LIDAR)                                                           

Summit Grid Reference:  SN 74725 96284 (LIDAR) 

Bwlch Height:  275.1m (LIDAR) 

Bwlch Grid Reference:  SN 75003 95681 (LIDAR) 

Drop:  24.6m (LIDAR) 

 

Myrddyn Phillips (December 2022)

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

Bwlch Corog (SN 731 947) – Sub-Trichant addition (183rd 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 Bwlch Corog (SN 731 947)

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 Bwlch Corog, and it is adjoined to the Banc Llechwedd Mawr group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north and south, and the A487 road to its west, and has the town of Machynlleth towards the north.

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 24m of drop, based on the 388m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 364m bwlch height based on interpolation of 10m contouring between 360m – 370m. 

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 bwlch contouring between 360m – 365m, with interpolation placing the height of the bwlch as an estimated c 363m, and when coupled with the 388m summit spot height these values gave this hill an estimated c 25m 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 confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 388.7m summit height and a 362.5m bwlch height, with these values giving this hill 26.2m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr 

Name:  Bwlch Corog 

OS 1:50,000 map:  135

Summit Height:  388.7m (LIDAR)                                                           

Summit Grid Reference:  SN 73158 94732 & SN 73161 94733 (LIDAR) 

Bwlch Height:  362.5m (LIDAR) 

Bwlch Grid Reference:  SN 73433 95079 (LIDAR) 

Drop:  26.2m (LIDAR) 

 

Myrddyn Phillips (December 2022)

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

Castell (SN 949 961) – Sub-Trichant deletion (182nd reclassification)

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

LIDAR image of Castell (SN 949 961)

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 Castell and this was derived from the Ordnance Survey series of Six-Inch maps, and it is adjoined to the Pumlumon group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with minor roads to its north and south, and the A470 road to its north-east, and has the village of Carno towards the east north-east.

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 20m of drop, based on the 325m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 305m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  With the caveat that the bwlch spot height was noted to be too low. 

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 bwlch contouring between 305m – 310m, with interpolation placing the height of the bwlch as an estimated c 307m, resulting in an estimated c 18m 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 confirmation of the deletion of this hill from Sub-Trichant status is due to LIDAR analysis, resulting in a 323.7m summit height and a 306.4m bwlch height, with these values giving this hill 17.3m of drop, which is insufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Pumlumon 

Name:  Castell 

OS 1:50,000 map:  136

Summit Height:  323.7m (LIDAR)                                                           

Summit Grid Reference:  SN 94917 96119 (LIDAR) 

Bwlch Height:  306.4m (LIDAR) 

Bwlch Grid Reference:  SN 94423 95831 (LIDAR) 

Drop:  17.3m (LIDAR) 

 

Myrddyn Phillips (November 2022)

 

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

Bryn y Gadair (SN 956 942) – Sub-Trichant addition (181st 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 initially conducted by Aled Williams and subsequently by Myrddyn Phillips. 

LIDAR image of Bryn y Gadair (SN 956 942)

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 Bryn y Gadair, and it is adjoined to the Pumlumon group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A470 road to its north-east and a minor road to its south, and has the village of Carno towards the north.

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 24m of drop, based on the 396m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 372m 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 396.8m summit height and a 370.7m 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:  Pumlumon 

Name:  Bryn y Gadair 

OS 1:50,000 map:  136

Summit Height:  396.8m (LIDAR)                                                           

Summit Grid Reference:  SN 95697 94281 (LIDAR) 

Bwlch Height:  370.7m (LIDAR) 

Bwlch Grid Reference:  SN 95476 94151 (LIDAR) 

Drop:  26.1m (LIDAR) 

 

Myrddyn Phillips (November 2022)

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

Allt Goch (SN 947 972) – Sub-Trichant addition (180th 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 Allt Goch (SN 947 972)

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 Allt Goch, and it is adjoined to the Pumlumon group of hills, which are situated in the northern part of South Wales (Region B, Sub-Region B1), and it is positioned with the A470 road to its north-east and a minor road to its south, and has the village of Carno 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.

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 309m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 288m 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 308.4m summit height and a 288.2m 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:  Pumlumon 

Name:  Allt Goch 

OS 1:50,000 map:  136

Summit Height:  308.4m (LIDAR)                                                           

Summit Grid Reference:  SN 94775 97259 (LIDAR) 

Bwlch Height:  288.2m (LIDAR) 

Bwlch Grid Reference:  SN 94675 97387 (LIDAR) 

Drop:  20.2m (LIDAR) 

 

Myrddyn Phillips (November 2022)

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

Yr Allt (SJ 139 039) – Sub-Trichant addition (179th 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 Yr Allt (SJ 139 039)

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 Yr Allt, and it is adjoined to the Carnedd Wen group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with minor roads to its north, west and east, and the B4390 road to its south, and has the village of Castell Caereinion 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 24m of drop, based on the 333m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 309m bwlch height, based on interpolation of 5m contouring between 305m – 310m. 

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 332.1m summit height and a 309.2m 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:  Carnedd Wen 

Name:  Yr Allt 

OS 1:50,000 map:  136

Summit Height:  332.1m (LIDAR)                                                           

Summit Grid Reference:  SJ 13929 03993 (LIDAR) 

Bwlch Height:  309.2m (LIDAR) 

Bwlch Grid Reference:  SJ 13923 04057 (LIDAR) 

Drop:  23.0m (LIDAR) 

 

Myrddyn Phillips (November 2022)

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

Pt. 316.7m (SJ 123 016) – Sub-Trichant addition (178th 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 detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Pt. 316.7m (SJ 123 016)

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. 316.7m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Carnedd Wen group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with the B4390 road to its north and minor roads to its west and south-east, and has the small community of Felin Newydd (New Mills) 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 twin summits with an estimated c 24m of drop, based on the 316m summit spot heights that appear on the Ordnance Survey 1:25,000 Explorer map and an estimated c 292m bwlch height based on interpolation of 10m contouring between 290m – 300m. 

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 and digitally updated 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 292m spot height on the area of the bwlch and when coupled with the 316m summit spot heights, these values gave this hill 24m of drop.

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 290m – 295m, with a reassessment of interpolation placing the height of the bwlch as an estimated c 293m and with this favoured when compared to the position of the 292m spot height, and when coupled with the 316m summit spot heights, these values gave this hill an estimated c 23m of drop.

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

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 316.7m summit height and an estimated c 293m bwlch height, with these values giving this hill an estimated c 24m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Pt. 316.7m 

OS 1:50,000 map:  136

Summit Height:  316.7m (LIDAR)                                                           

Summit Grid Reference:  SJ 12315 01617 (LIDAR) 

Bwlch Height:  c 293m (interpolation) 

Bwlch Grid Reference:  SJ 12474 01282 (interpolation) 

Drop:  c 24m (LIDAR summit and interpolated bwlch) 

 

Myrddyn Phillips (November 2022)

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

Pt. 314m (SJ 124 010) – Sub-Trichant addition (177th 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 detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR bwlch image of Pt. 314m (summit at SJ 124 010)

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. 314m) notation as an appropriate name for it either through local enquiry and/or historic research has not been found by the author, and it is adjoined to the Carnedd Wen group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned enclosed by minor roads, with the B4390 road farther to its north, the B4389 road farther to its south-west and the A483 road farther to its south-east, and has the small community of Manafon 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 21m of drop, based on the 313m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 292m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

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

Since the original publication of the 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 314m summit spot height. 

Extract from the Magic Maps website

Another mapping resource 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 the 314m spot height is also given on the summit area of this hill, and this is being favoured over the 313m spot height that appears on the Ordnance Survey 1:25,000 Explorer map. 

Extract from the WalkLakes website

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

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis, resulting in a 314m summit height and a 293.3m bwlch height, with these values giving this hill 21m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Pt. 314m 

OS 1:50,000 map:  136

Summit Height:  314m (spot height)                                                           

Summit Grid Reference:  SJ 12452 01093 (spot height) 

Bwlch Height:  293.3m (LIDAR) 

Bwlch Grid Reference:  SJ 12315 01337 (LIDAR) 

Drop:  21m (spot height summit and LIDAR bwlch) 

 

Myrddyn Phillips (November 2022)

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

Mynydd Llanfair (SJ 038 040) – Sub-Trichant addition (176th reclassification)

Summit Relocations post for Mynydd Llanfair

Significant Name Changes post for Mynydd Llanfair

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 Llanfair (SJ 038 040)

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 Llanfair and this was derived from the Tithe map, and it is adjoined to the Carnedd Wen group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with the A458 road to its north, a minor road to its south and the A470 road to its south-west, and has the small town of Llanfair Caereinion towards the east north-east.

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

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 374m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 353m bwlch height, based on interpolation of 5m contouring between 350m – 355m. 

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 373.7m summit height and a 351.9m bwlch height, with these values giving this hill 21.8m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Mynydd Llanfair 

OS 1:50,000 map:  136

Summit Height:  373.7m (LIDAR)                                                           

Summit Grid Reference:  SJ 03809 04011 (LIDAR) 

Bwlch Height:  351.9m (LIDAR) 

Bwlch Grid Reference:  SJ 03291 04027 (LIDAR) 

Drop:  21.8m (LIDAR) 

 

Myrddyn Phillips (October 2022)