Mapping Mountains - Hill Reclassifications - The Welsh Highlands - Uchafion Cymru

 

The Welsh Highlands - Uchafion Cymru – Hill Reclassifications

The Welsh 500m P15s are the Welsh hills at or above 500m in height that have a minimum drop of 15m.  Accompanying the main P15 list are three sub lists; these are the 500m Subs, 490m Subs and the Double Subs with their criteria detailed in the respective Change Registers which are linked in their above titles, with details to this list given in the Introduction that was published on Mapping Mountains in November 2015.

The list is co-authored by Myrddyn Phillips and Aled Williams and the posts that have appeared on Mapping Mountains detailing the additions, reclassifications and deletions to the main P15 list and the sub lists appear below presented chronologically in receding order.

Postscript: On the 7^th January 2023 it was announced that the sub hills accompanying the main listing of the Welsh Highlands – Uchafion Cymru now take in just one category, this category is entitled the Welsh Highland Subs.  The criteria for which are all Welsh hills at and above 500m in height with 10m or more and below 15m of drop.

Therefore, the 490m Subs and 490m Double Subs have been dispensed with and the criteria for the 500m Subs that included Welsh hills with 14m or more and below 15m of drop, have been amended to include Welsh hills with 10m or more and below 15m of drop and their title changed to the Welsh Highland Subs.

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 528.0m (SN 814 709) – Welsh Highland Sub deletion (105th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 528.0m (SN 814 709)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The hill is being listed by the point (Pt. 528.0m) notation 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 and south-west, and the B4343 road to its west, and has the village of Pont-rhyd-y-groes towards the west north-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 529m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and an estimated c 519m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 528.0m summit height and a 518.4m bwlch height, with these values giving this hill 9.6m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod

Name:  Pt. 528.0m

OS 1:50,000 map:  135, 136, 147

Summit Height:  528.0m (LIDAR)

Summit Grid Reference:  SN 81417 70932 (LIDAR)

Bwlch Height:  518.4m (LIDAR)

Bwlch Grid Reference:  SN 81191 70843 (LIDAR)   

Drop:  9.6m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (January 2024)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Trawsallt (SN 782 701) – Welsh Highland Sub addition (104th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Trawsallt (SN 782 701)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Trawsallt 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 and the B4574 road to its north, the B4343 road to its west and a minor road to its south, and has the village of Pont-rhyd-y-groes towards the north-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 7m of drop, based on the 564m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and an estimated c 557m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 564.5m summit height and a 552.8m bwlch height, with these values giving this hill 11.7m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Carn yr Hyrddod

Name:  Trawsallt

OS 1:50,000 map:  135, 147

Summit Height:  564.5m (LIDAR)

Summit Grid Reference:  SN 78298 70193 (LIDAR)

Bwlch Height:  552.8m (LIDAR)

Bwlch Grid Reference:  SN 78147 70153 (LIDAR)   

Drop:  11.7m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pen y Bwlch (SN 929 669) – Welsh Highland Sub deletion (103rd reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pen y Bwlch (SN 929 669)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Pen y Bwlch 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 west, and the B4518 road to its south-east, and has the town of Rhaeadr Gwy towards the east north-east.

This hill was originally listed as a sub due to a basic levelling survey conducted by Myrddyn Phillips on the 17.08.05 resulting in a 47ft (14.3m) drop value, with the summit height listed as an estimated c 500m, based on interpolation of the small uppermost 500m ring contour that appears on the contemporary Ordnance Survey 1:25,000 Explorer map. 

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

When the initial P10 sub list was completed in June 2020 this hill was included as a sub with an accompanying note stating:

LIDAR 2m DSM bwlch by AW. BLS by MP on 17/08/2005 giving 47ft (14.3m). Adding the BLS drop result to the bwlch height determined via LIDAR analysis gives a summit height of 500.1m. Summit height is inconsistent on OS maps, giving a range of 499m to 500m. Partial coverage LIDAR 2m DSM by AW gives 498.1m summit-area high point at SN 92831 66910. The OS 6" Map (1888) gives a 1633ft (497.7m) summit-area high point at SN 93067 66918.

However, it was not until full LIDAR coverage 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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 499.6m summit height and a 485.6m bwlch height, with these values giving this hill 14.05m of drop, with its height being insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Y Garn

Name:  Pen y Bwlch

OS 1:50,000 map:  136, 147

Summit Height:  499.6m (LIDAR)

Summit Grid Reference:  SN 92901 66972 (LIDAR)

Bwlch Height:  485.6m (LIDAR)

Bwlch Grid Reference:  SN 92677 66989 (LIDAR)   

Drop:  14.05m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Foel Ddu (SN 852 799) – Welsh Highland Sub addition (102nd reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Foel Ddu (SN 852 799)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Foel 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 the A44 road to its north-east and a minor road to its south-east, and has the village of Llangurig towards the east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 8m of drop, based on an estimated c 530m summit height and an estimated c 522m bwlch height, with both heights based on interpolation of 5m contouring that appeared on online mapping, with an accompanying note stating; Paper OS maps give a summit height of 532m, which isn't supported by contour data on the enlarged-scale online OS maps. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 532.1m summit height and a 520.9m bwlch height, with these values giving this hill 11.2m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Y Garn

Name:  Foel Ddu

OS 1:50,000 map:  135, 136, 147

Summit Height:  532.1m (LIDAR)

Summit Grid Reference:  SN 85278 79929 (LIDAR)

Bwlch Height:  520.9m (LIDAR)

Bwlch Grid Reference:  SN 85005 79801 (LIDAR)   

Drop:  11.2m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Esgair Neint (SN 785 801) – Welsh Highland Sub addition (101st reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Esgair Neint (SN 785 801)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Esgair Neint 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 A44 road to its north-west, and the B4343 road and the A4120 road to its west, and has the village of Ponterwyd towards the west north-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on a 532m summit height and an estimated c 522m bwlch height, with the latter based on interpolation of 5m contouring that appeared on online mapping. 

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

When the details for this hill were updated with data from basic levelling surveys conducted by Myrddyn Phillips, the drop was amended to 9.9m, based on a 32½ft/9.9m basic levelling survey conducted on the 24.09.04.

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 535.5m summit height and a 525.5m bwlch height, with these values giving this hill 10.0m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Y Garn

Name:  Esgair Neint

OS 1:50,000 map:  135

Summit Height:  535.5m (LIDAR)

Summit Grid Reference:  SN 78508 80178 (LIDAR)

Bwlch Height:  525.5m (LIDAR)

Bwlch Grid Reference:  SN 78586 80342 (LIDAR)   

Drop:  10.0m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023) 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Llechwedd Diflas (SN 789 930) – Welsh Highland Sub deletion (100th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Llechwedd Diflas (SN 789 930)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Llechwedd Diflas 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 south south-west and east north-east, and has the village of Penffordd-las (Staylittle) towards the east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 514m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map, and an estimated c 504m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 513.4m summit height and a 503.8m bwlch height, with these values giving this hill 9.5m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Pumlumon

Name:  Llechwedd Diflas

OS 1:50,000 map:  135

Summit Height:  513.4m (LIDAR)

Summit Grid Reference:  SN 78935 93043 (LIDAR)

Bwlch Height:  503.8m (LIDAR)

Bwlch Grid Reference:  SN 79224 92986 (LIDAR)   

Drop:  9.5m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Bryn Glas (SN 769 825) – Welsh Highland Sub addition (99th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Bryn Glas (SN 769 825)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Bryn Glas 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 a minor road to its west and the A44 road to its south-east, and has the village of Ponterwyd towards the south-west. 

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

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on a 515.9m summit height ascertained from 2m DSM LIDAR analysis and an estimated c 507m bwlch height, based on interpolation of 5m contouring that appeared on online mapping.

However, it was not until full LIDAR coverage 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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 515.9m summit height and a 505.3m bwlch height, with these values giving this hill 10.6m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Pumlumon

Name:  Bryn Glas

OS 1:50,000 map:  135

Summit Height:  515.9m (LIDAR)

Summit Grid Reference:  SN 76971 82536 (LIDAR)

Bwlch Height:  505.3m (LIDAR)

Bwlch Grid Reference:  SN 77385 82735 (LIDAR)   

Drop:  10.6m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Llechwedd Crin (SN 813 922) – Welsh Highland Sub addition (98th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Llechwedd Crin (SN 813 922)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Llechwedd Crin 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 a minor road to its north-east and its south-west, the B4518 road to its east and the A44 road to its south, and has the village of Penffordd-las (Staylittle) towards the east. 

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

After the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was listed with an estimated c 10m of drop, based on partial LIDAR coverage giving a 536m summit height and a 526m bwlch height.

When the details for this hill were updated with data from basic levelling surveys conducted by Myrddyn Phillips, the drop was amended to below 10m, based on a 31½ft/9.6m basic levelling survey conducted on the 22.05.04.

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 536.2m summit height and a 525.6m bwlch height, with these values giving this hill 10.6m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Pumlumon

Name:  Llechwedd Crin

OS 1:50,000 map:  135, 136

Summit Height:  536.2m (LIDAR)

Summit Grid Reference:  SN 81384 92266 (LIDAR)

Bwlch Height:  525.6m (LIDAR)

Bwlch Grid Reference:  SN 81539 92254 (LIDAR)   

Drop:  10.6m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (December 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 505.8m (SN 785 598) – Welsh Highland Sub addition (97th reclassification)

Survey post for Pt. 505.8m

Significant Height Revisions post for Pt. 505.8m

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 505.8m (SN 785 598)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The hill is being listed by the point (Pt. 505.8m) notation 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-west and south, and has the small community of Pontrhydfendigaid towards the north-west and the town of Tregaron towards the west. 

Extract from the Ordnance Survey series of Six-Inch maps

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on the 1649ft (502.6m) height that appeared on the Ordnance Survey series of Six-Inch maps and an estimated c 494m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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

The height that appeared on the Ordnance Survey series of Six-Inch maps was at odds with the 506m spot height that appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and which is positioned at SN 78576 59903, however this spot height was not supported by contemporary contour information on large scaled Ordnance Survey maps. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 505.8m summit height and a 492.4m bwlch height, with these values giving this hill 13.5m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Esgair Wen

Name:  Pt. 505.8m

OS 1:50,000 map:  146, 147

Summit Height:  505.8m (LIDAR)

Summit Grid Reference:  SN 78575 59899 (LIDAR)

Bwlch Height:  492.4m (LIDAR)

Bwlch Grid Reference:  SN 78513 60070 (LIDAR)   

Drop:  13.5m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (November 2023)

  

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Esgair Saeson (SN 795 603) – Welsh Highland P15 deletion (96th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Esgair Saeson (SN 795 603)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The name the hill is listed by is Esgair Saeson 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-west and south, and has the small community of Pontrhydfendigaid towards the north-west and the town of Tregaron towards the west.

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was included as a Welsh Highland P15 and listed with an estimated c 24m of drop, based on the 500m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 476m bwlch height, based on interpolation of 10m contouring between 470m – 480m. 

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

Since the original compilation of this list 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 475m bwlch spot height positioned at SN 79101 60658, and when coupled with its 500m summit spot height these values gave this hill 25m 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 470m – 475m, with interpolation placing the height of the bwlch as an estimated c 473m, resulting in its drop value being amended to an estimated c 27m.

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 Welsh Highland P15 status is due to a LIDAR analysis, resulting in a 498.4m summit height and a 473.8m bwlch height, with these values giving this hill 24.6m of drop, with its height insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Esgair Wen

Name:  Esgair Saeson

OS 1:50,000 map:  146, 147

Summit Height:  498.4m (LIDAR)

Summit Grid Reference:  SN 79504 60391 (LIDAR)

Bwlch Height:  473.8m (LIDAR)

Bwlch Grid Reference:  SN 79174 60567 (LIDAR)   

Drop:  24.6m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (November 2023) 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 516.9m (SN 754 620) – Welsh Highland Sub reclassified to Welsh Highland P15 (95th reclassification)

Hill Reclassifications post for Pt. 516.9m

Survey post for Pt. 516.9m

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

Pt. 516.9m (SN 754 620)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The hill is being listed by the point (Pt. 516.9m) notation 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 north-west and south, and has the small community of Pontrhydfendigaid towards the north-west and the town of Tregaron towards the west south-west.

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was not included as a Welsh Highland P15 as with no spot height adjoined to its uppermost 510m ring contour and bwlch contouring between 500m – 510m, the drop value could not be interpolated accurately to include it in this list. 

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

Since the original compilation of this list 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 517m summit spot height and a 502m bwlch spot height, with these values giving this hill 15m of drop and therefore it was included as a Welsh Highland P15. 

Extract from the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map

The hill was subsequently surveyed with the Trimble GeoXH 6000, resulting in a 516.3m summit height and a 501.4m bwlch height.  However, as the area of the bwlch is situated in conifer plantation it was decided to use an interpolated height and position from OS Maps.  This mapping gave contour intervals at 5m and showed a small 500m ring contour where the 502m spot height appears on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website, data were collected from near this position resulting in a 501.4m height, but when doing so the authors were aware that land to the north-east was judged slightly higher and this is what the 5m contouring on the OS Maps website indicated.  Therefore, the hill was listed with an estimated c 14m of drop, resulting in its reclassification to Welsh Highland Sub status. 

Extract from the interactive mapping that was hosted on the OS Maps website

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

LIDAR image of Pt. 516.9m (SN 754 620)

Therefore, the reclassification of this hill from Welsh Highland Sub status is due to a LIDAR analysis, resulting in a 516.9m summit height and a 501.0m bwlch height, with these values giving this hill 15.8m of drop, which is sufficient for it to be reinstated and classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Esgair Wen

Name:  Pt. 516.9m

OS 1:50,000 map:  146, 147

Summit Height:  516.9m (LIDAR)

Summit Grid Reference:  SN 75493 62086 (LIDAR)

Bwlch Height:  501.0m (LIDAR)

Bwlch Grid Reference:  SN 75576 61971 (LIDAR)   

Drop:  15.8m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (November 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 526.8m (SN 745 611) – Welsh Highland P15 reclassified to Welsh Highland Sub (94th reclassification)

Hill Reclassifications post for Pt. 526.8m

Survey post for Pt. 526.8m

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from a Trimble GeoXH 6000 summit survey and LIDAR bwlch analysis conducted by Myrddyn Phillips and Aled Williams. 

Pt. 526.8m (SN 745 611)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Aled Williams and Myrddyn Phillips

The hill is being listed by the point (Pt. 526.8m) notation 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 south, and has the small community of Pontrhydfendigaid towards the north-west and the town of Tregaron towards the west.

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was not included as a Welsh Highland P15 as with a 527m summit spot height and bwlch contouring between 510m – 520m that appear on the contemporary Ordnance Survey 1:25,000 Explorer map, interpolation gave this hill less than 15m of drop. 

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

Since the original compilation of this list 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 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 510m – 515m, with interpolation placing the height of the bwlch as an estimated c 511m, and when coupled with the 527m summit spot height these values gave this hill an estimated c 16m of drop, and therefore it was included as a Welsh Highland P15. 

Extract from the interactive mapping that was hosted on the OS Maps website

The hill was subsequently surveyed with the Trimble GeoXH 6000, resulting in a 526.8m summit height and a 511.9m bwlch height.  Although this survey gave this hill 14.9m of drop, it was decided that the bwlch position was incorrect and therefore the hill was retained as a Welsh Highland P15. 

The Trimble GeoXH 6000 gathering data at the summit of Pt. 526.8m (SN 745 611)

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

LIDAR image of Pt. 526.8m (SN 745 611)

Therefore, the reclassification of this hill to Welsh Highland Sub status is due to a Trimble GeoXH 6000 summit survey and LIDAR bwlch analysis, resulting in a 526.8m summit height and a 512.0m bwlch height, with these values giving this hill 14.8m of drop, which is insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Esgair Wen

Name:  Pt. 526.8m

OS 1:50,000 map:  146, 147

Summit Height:  526.8m (Trimble GeoXH 6000)

Summit Grid Reference:  SN 74595 61119 (Trimble GeoXH 6000)

Bwlch Height:  512.0m (LIDAR)

Bwlch Grid Reference:  SN 74980 61422 (LIDAR)   

Drop:  14.8m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (November 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Esgair Neint (SN 783 800) – Welsh Highland P15 reclassified to Welsh Highland Sub (93rd reclassification)

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Esgair Neint (SN 783 800)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Esgair Neint 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 A44 road to its north-west, and the B4343 road and the A4120 road to its west, and has the village of Ponterwyd towards the west north-west. 

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

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was included as a Welsh Highland P15 and listed with 15m of drop, based on a 49½ft/15.1m basic levelling survey conducted by Myrddyn Phillips on the 24.09.04.

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

Therefore, the reclassification of this hill to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 538.1m summit height and a 523.6m bwlch height, with these values giving this hill 14.4m of drop, which is insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Y Garn

Name:  Esgair Neint

OS 1:50,000 map:  135

Summit Height:  538.1m (LIDAR)

Summit Grid Reference:  SN 78369 80073 (LIDAR)

Bwlch Height:  523.6m (LIDAR)

Bwlch Grid Reference:  SN 78433 80149 (LIDAR)   

Drop:  14.4m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 557.5m (SN 794 816) – Welsh Highland P15 reclassified to Welsh Highland Sub (92nd reclassification)

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 557.5m (SN 794 816)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 557.5m) notation 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 A44 road to its north, and the B4343 road and the A4120 road to its west south-west, and has the village of Ponterwyd towards the west.

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was included as a Welsh Highland P15 and listed with 15m of drop, based on a 50ft/15.2m basic levelling survey conducted by Myrddyn Phillips on the 24.09.04. 

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 to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 557.5m summit height and a 543.1m bwlch height, with these values giving this hill 14.4m of drop, which is insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Y Garn

Name:  Pt. 557.5m

OS 1:50,000 map:  135

Summit Height:  557.5m (LIDAR)

Summit Grid Reference:  SN 79410 81689 (LIDAR)

Bwlch Height:  543.1m (LIDAR)

Bwlch Grid Reference:  SN 79407 81465 (LIDAR)   

Drop:  14.4m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023) 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Ochr Llygnant (SN 796 917) – Welsh Highland P15 reclassified to Welsh Highland Sub (91st reclassification)

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Ochr Llygnant (SN 796 917)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Ochr Llygnant 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 a minor road to its north-east and its south south-west, the B4518 road to its east and the A44 road to its south, and has the village of Penffordd-las (Staylittle) towards the east. 

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

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was included as a Welsh Highland P15 and listed with 15m of drop, based on a 49½ft/15.1m basic levelling survey conducted by Myrddyn Phillips on the 03.10.05.

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

Therefore, the reclassification of this hill to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 550.4m summit height and a 536.0m bwlch height, with these values giving this hill 14.4m of drop, which is insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Pumlumon

Name:  Ochr Llygnant

OS 1:50,000 map:  135

Summit Height:  550.4m (LIDAR)

Summit Grid Reference:  SN 79677 91711 (LIDAR)

Bwlch Height:  536.0m (LIDAR)

Bwlch Grid Reference:  SN 80023 91716 & SN 80022 91736 (LIDAR)   

Drop:  14.4m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Foel Fach (SN 764 931) – Welsh Highland P15 reclassified to Welsh Highland Sub (90th reclassification)

 

There has been a reclassification to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Foel Fach (SN 764 931)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Foel Fach 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 and south, the A487 road to its west, the A44 road to its south and the B4518 road to its east, and has the town of Machynlleth towards the north. 

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

When the original list that later became known as the Welsh Highlands – Uchafion Cymru was first compiled, this hill was included as a Welsh Highland P15 and listed with 15m of drop, based on a 50ft/15.2m basic levelling survey conducted by Myrddyn Phillips on the 01.11.05.

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

Therefore, the reclassification of this hill to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 503.8m summit height and a 489.2m bwlch height, with these values giving this hill 14.7m of drop, which is insufficient for it to be classified as a Welsh Highland P15. 

 

The full details for the hill are: 

Group:  Banc Llechwedd Mawr

Name:  Foel Fach

OS 1:50,000 map:  135

Summit Height:  503.8m (LIDAR)

Summit Grid Reference:  SN 76446 93126 (LIDAR)

Bwlch Height:  489.2m (LIDAR)

Bwlch Grid Reference:  SN 76530 93140 (LIDAR)   

Drop:  14.7m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 686.3m (SH 736 136) – Welsh Highland Sub deletion (89th reclassification)

 

There has been a deletion from listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 686.3m (SH 736 136)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 686.3m) notation and it is adjoined to the Cadair Idris group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A487 road to its south-east, and has the town of Dolgellau towards the north. 

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

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 2250ft (685.8m) summit height that appears on the Ordnance Survey series of Six-Inch maps and an estimated c 676m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

Extract from the Ordnance Survey series of Six-Inch maps

When the sub list was updated with details from basic levelling surveys conducted by Myrddyn Phillips the details for this hill were re-evaluated and it was listed with 10.4m of drop, based on a basic levelling survey conducted on the 10.10.98 which gave this hill 34.0ft 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 deletion of this hill from Welsh Highland Sub status is due to LIDAR analysis, resulting in a 686.3m summit height and a 678.1m bwlch height, with these values giving this hill 8.2m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Cadair Idris

Name:  Pt. 686.3m

OS 1:50,000 map:  124

Summit Height:  686.3m (LIDAR)

Summit Grid Reference:  SH 73642 13623 (LIDAR)

Bwlch Height:  678.1m (LIDAR)

Bwlch Grid Reference:  SH 73540 13543 (LIDAR)   

Drop:  8.2m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 657.9m (SH 856 209) – Welsh Highland Sub deletion (88th reclassification)

 

There has been a deletion from listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 657.9m (SH 856 209)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 657.9m) notation and it is adjoined to the Aran Fawddwy group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A494 road to its north-west and minor roads to its south and east, and has the village of Dinas Mawddwy towards the south.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 8m of drop, based on the 657m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 649m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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

When the sub list was updated with details from basic levelling surveys conducted by Myrddyn Phillips the details for this hill were re-evaluated and it was listed with 10.8m of drop, based on a basic levelling survey conducted on the 19.05.98 which gave this hill 35.3ft of drop, resulting in the addition of this hill to the sub list.

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 657.9m summit height and a 648.1m bwlch height, with these values giving this hill 9.8m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Aran Fawddwy

Name:  Pt. 657.9m

OS 1:50,000 map:  124, 125

Summit Height:  657.9m (LIDAR)

Summit Grid Reference:  SH 85683 20921 (LIDAR)

Bwlch Height:  648.1m (LIDAR)

Bwlch Grid Reference:  SH 85705 20958 (LIDAR)   

Drop:  9.8m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023) 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 844.2m (SH 869 246) – Welsh Highland Sub addition (87th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 844.2m (SH 869 246)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 844.2m) notation and it is adjoined to the Aran Fawddwy group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A494 road to its north-west and a minor road to its north-east, and has the village of Llanuwchllyn towards the north.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 844m summit spot height that appeared on the enlarged scale Ordnance Survey map available online and an estimated c 834m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. 

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

When the sub list was updated with details from basic levelling surveys conducted by Myrddyn Phillips the details for this hill were re-evaluated and it was listed with 8.5m of drop, based on a basic levelling survey conducted on the 19.09.98 which gave this hill 28ft of drop, resulting in the deletion of this hill from the sub list.

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in an 844.2m summit height and an 833.6m bwlch height, with these values giving this hill 10.5m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Aran Fawddwy

Name:  Pt. 844.2m

OS 1:50,000 map:  124, 125

Summit Height:  844.2m (LIDAR)

Summit Grid Reference:  SH 86926 24690 (LIDAR)

Bwlch Height:  833.6m (LIDAR)

Bwlch Grid Reference:  SH 86852 24656 (LIDAR)   

Drop:  10.5m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (October 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 505.5m (SH 967 199) – Welsh Highland Sub deletion (86th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 505.5m (SH 967 199)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 505.5m) notation and it is adjoined to the Esgeiriau Gwynion group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with the B4343 road to its north-east and a minor road to its south-east, and has the village of Llanwddyn towards the east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 506m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and an estimated c 496m bwlch height, based on interpolation of 5m contouring that appeared online. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 505.5m summit height and a 497.1m bwlch height, with these values giving this hill 8.4m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Esgeiriau Gwynion

Name:  Pt. 505.5m

OS 1:50,000 map:  125

Summit Height:  505.5m (LIDAR)

Summit Grid Reference:  SH 96714 19988 (LIDAR)

Bwlch Height:  497.1m (LIDAR)

Bwlch Grid Reference:  SH 96813 20159 (LIDAR)   

Drop:  8.4m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Hen Gerrig (SH 950 187) – Welsh Highland Sub addition (85th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams.

LIDAR image of Hen Gerrig (SH 950 187)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Hen Gerrig and it is adjoined to the Esgeiriau Gwynion group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with the B4343 road to its north-east, minor roads to its west and south south-east and the A458 road to its south, and has the village of Llanwddyn towards the east.

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

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on a 518m summit height taken from the 1698ft (517.6m) height that appears on the Ordnance Survey series of Six-Inch maps, and an estimated c 509m bwlch height, based on interpolation of 5m contouring that appeared online.

Extract from the Ordnance Survey series of Six-Inch maps

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 518.1m summit height and a 507.9m bwlch height, with these values giving this hill 10.2m of drop, which is sufficient for it to be classified as a Welsh Highland Sub.

The full details for the hill are: 

Group:  Esgeiriau Gwynion

Name:  Hen Gerrig

OS 1:50,000 map:  125

Summit Height:  518.1m (LIDAR)

Summit Grid Reference:  SH 95070 18770 (LIDAR)

Bwlch Height:  507.9m (LIDAR)

Bwlch Grid Reference:  SH 95012 18806 (LIDAR)   

Drop:  10.2m (LIDAR) 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Cerrig Duon (SJ 128 384) – Welsh Highland Sub deletion (84th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Cerrig Duon (SJ 128 384)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Cerrig Duon and it is adjoined to the Craig Berwyn group of hills, which are situated in the eastern part of North Wales (Region A, Sub-Region A3), and it is positioned with a minor road to its north-east and the A5 road to its north, and has the town of Llangollen towards the east north-east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 12m of drop, based on the 551m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 539m bwlch height, based on interpolation of 5m contouring that appeared online. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 549.3m summit height and a 540.0m bwlch height, with these values giving this hill 9.3m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Craig Berwyn

Name:  Cerrig Duon

OS 1:50,000 map:  125

Summit Height:  549.3m (LIDAR)

Summit Grid Reference:  SJ 12833 38497 (LIDAR)

Bwlch Height:  540.0m (LIDAR)

Bwlch Grid Reference:  SJ 12785 38809 (LIDAR)   

Drop:  9.3m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 568.7m (SJ 133 392) – Welsh Highland Sub deletion (83rd reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 568.7m (SJ 133 392)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 568.7m) notation and it is adjoined to the Craig Berwyn group of hills, which are situated in the eastern part of North Wales (Region A, Sub-Region A3), and it is positioned with a minor road to its north-east and the A5 road to its north, and has the town of Llangollen towards the east north-east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on the 568m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 558m bwlch height, based on interpolation of 5m contouring that appeared online. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 568.7m summit height and a 558.9m bwlch height, with these values giving this hill 9.8m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Craig Berwyn

Name:  Pt. 568.7m

OS 1:50,000 map:  125

Summit Height:  568.7m (LIDAR)

Summit Grid Reference:  SJ 13353 39284 (LIDAR)

Bwlch Height:  558.9m (LIDAR)

Bwlch Grid Reference:  SJ 12789 39284 (LIDAR)   

Drop:  9.8m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Bryn Ceffyl (SH 786 371) – Welsh Highland Sub addition (82nd reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Bryn Ceffyl (SH 786 371)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Bryn Ceffyl, and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with the A4212 road to its north, and has the town of Y Bala towards the east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 7m of drop, based on a 505m summit height and an estimated c 498m bwlch height. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 506.7m summit height and a 496.3m bwlch height, with these values giving this hill 10.5m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Bryn Ceffyl

OS 1:50,000 map:  124

Summit Height:  506.7m (LIDAR)

Summit Grid Reference:  SH 78639 37135 (LIDAR)

Bwlch Height:  496.3m (LIDAR)

Bwlch Grid Reference:  SH 78628 37059 (LIDAR)   

Drop:  10.5m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023) 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 510.0m (SH 819 314) – Welsh Highland Sub addition (81st reclassification)

Signifcant Height Revisions post for Pt. 510.0m

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 510.0m (SH 819 314)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 510.0m) notation and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road to its north-east and the A494 road to its south-east, and has the town of Y Bala towards the east north-east.

When the initial P10 sub list was completed in June 2020 this hill was listed with 9m of drop, based on the 508m summit spot height which appears on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 499.0m bwlch height ascertained from 1m DSM LIDAR analysis. 

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

However, it was not until full LIDAR coverage 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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 510.0m summit height and a 499.1m bwlch height, with these values giving this hill 10.9m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Pt. 510.0m

OS 1:50,000 map:  124, 125

Summit Height:  510.0m (LIDAR)

Summit Grid Reference:  SH 81962 31463 (LIDAR)

Bwlch Height:  499.1m (LIDAR)

Bwlch Grid Reference:  SH 82130 31691 (LIDAR)   

Drop:  10.9m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (September 2023)

  

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 510.8m (SH 772 246) – Welsh Highland Sub addition (80th reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 510.8m (SH 772 246)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 510.8m) notation and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road to its west and south-east, with the A470 road farther to its west and the A494 road farther to its south-east, and has the town of Dolgellau towards the south-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on a 510m summit height and an estimated c 501m bwlch height, with the latter based on interpolation of 5m contouring available online. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 510.8m summit height and a 500.0m bwlch height, with these values giving this hill 10.8m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Pt. 510.8m

OS 1:50,000 map:  124

Summit Height:  510.8m (LIDAR)

Summit Grid Reference:  SH 77218 24611 (LIDAR)

Bwlch Height:  500.0m (LIDAR)

Bwlch Grid Reference:  SH 77276 24637 (LIDAR)   

Drop:  10.8m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (August 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Graig Fach (SH 792 249) – Welsh Highland Sub deletion (79th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Graig Fach (SH 792 249)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Graig Fach and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road to its south south-east and the A494 road farther to its south-east, and has the small community of Rhyd-y-main towards the south south-east.

When the initial P10 sub list was completed in June 2020 this hill was listed with 10.2m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 10.04.06, and listed with a 510m summit height and a 500m bwlch height, with an accompanying note stating that analysis of numerical data on various scales of Ordnance Survey maps give this hill an estimated c 9m of drop.  Therefore, it was included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 511.3m summit height and a 501.4m bwlch height, with these values giving this hill 9.9m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Graig Fach

OS 1:50,000 map:  124

Summit Height:  511.3m (LIDAR)

Summit Grid Reference:  SH 79263 24920 (LIDAR)

Bwlch Height:  501.4m (LIDAR)

Bwlch Grid Reference:  SH 79277 24975 (LIDAR)   

Drop:  9.9m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (August 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Y Ddau Faen Llwyd (SH 804 310) – Welsh Highland Sub deletion (78th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Y Ddau Faen Llwyd (SH 804 310)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Y Ddau Faen Llwyd and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road to its north-east and south-west, and has the village of Llanuwchllyn towards the east. 

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

When the initial P10 sub list was completed in June 2020 this hill was listed with 10m of drop, based on the 537m summit spot height that appears on online mapping, including the interactive map hosted on the WalkLakes website and a 527m bwlch height, based on the 1730ft (527.3m) levelled height that appears on the Ordnance Survey series of Six-Inch maps.  Therefore, it was included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

Extract from the interactive mapping hosted on the WalkLakes website

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

Extract from the Ordnance Survey series of Six-Inch maps

Therefore, the deletion of this hill from Welsh Highland Sub status is due to LIDAR analysis, resulting in a 537.3m summit height and a 527.6m bwlch height, with these values giving this hill 9.7m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Y Ddau Faen Llwyd

OS 1:50,000 map:  124, 125

Summit Height:  537.3m (LIDAR)

Summit Grid Reference:  SH 80456 31074 (LIDAR)

Bwlch Height:  527.6m (LIDAR)

Bwlch Grid Reference:  SH 80534 31223 (LIDAR)   

Drop:  9.7m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (August 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 590.9m (SH 776 249) – Welsh Highland Sub deletion (77th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 590.9m (SH 776 249)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 590.9m) notation and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road to its west and south south-east, with the A470 road farther to its west and the A494 road farther to its south-east, and has the town of Dolgellau towards the south-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on the 591m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 582m bwlch height, based on interpolation of 10m contouring between 580m – 590m.  However, its status was re-evaluated on the 26.03.22 after an on-site visit and examination of updated 5m contouring and it was subsequently listed as a Welsh Highland Sub with an estimated c 10m of drop. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 590.9m summit height and a 581.5m bwlch height, with these values giving this hill 9.5m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Pt. 590.9m

OS 1:50,000 map:  124

Summit Height:  590.9m (LIDAR)

Summit Grid Reference:  SH 77617 24963 (LIDAR)

Bwlch Height:  581.5m (LIDAR)

Bwlch Grid Reference:  SH 77711 25065 (LIDAR)   

Drop:  9.5m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (August 2023)

 

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

DUE TO A TRIMBLE GEOXH 6000 SURVEY THIS HILL HAS SUBSEQUENTLY BEEN REINSTATED TO WELSH HIGHLAND SUB STATUS

Pen Tyrau (SH 837 382) – Welsh Highland Sub deletion (76th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pen Tyrau (SH 837 382)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Pen Tyrau, and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales (Region A, Sub-Region A2), and it is positioned with a minor road and the A4212 road to its north, and has the town of Y Bala towards the east south-east.

When the initial P10 sub list was completed in June 2020 this hill was listed with 10.4m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 14.09.98, and listed with a 697m summit height a 687m bwlch height, with an accompanying note stating that analysis of numerical data on various scales of Ordnance Survey maps give this hill an estimated c 9m of drop.  Therefore, it was included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 697.8m summit height and a 688.1m bwlch height, with these values giving this hill 9.7m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Arenig Fawr

Name:  Pen Tyrau

OS 1:50,000 map:  124, 125

Summit Height:  697.8m (LIDAR)

Summit Grid Reference:  SH 83744 38244 (LIDAR)

Bwlch Height:  688.1m (LIDAR)

Bwlch Grid Reference:  SH 83602 38147 (LIDAR)   

Drop:  9.7m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (July 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

DUE TO A SUBSEQUENT TRIMBLE GEOXH 6000 SURVEY THIS HILL HAS BEEN REINSTATED TO WELSH HIGHLAND SUB STATUS

Pt. 906.2m (SH 619 551) – Welsh Highland Sub deletion (75th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pt. 906.2m (SH 619 551)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 906.2m) notation and it is adjoined to the Yr Wyddfa group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the A4086 road to its north-east, the A4085 road to its west and the A498 road to its south-east, and has the village of Nant Peris towards the north north-west.

When the initial P10 sub list was completed in June 2020 this hill was listed with 10.4m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 20.09.98, and listed with a 906m summit height an 896m bwlch height, with an accompanying note stating that analysis of numerical data on various scales of Ordnance Survey maps give this hill 9m of drop.  Therefore, it was included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 906.2m summit height and an 896.4m bwlch height, with these values giving this hill 9.8m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Yr Wyddfa

Name:  Pt. 906.2m

OS 1:50,000 map:  115

Summit Height:  906.2m (LIDAR)

Summit Grid Reference:  SH 61982 55146 (LIDAR)

Bwlch Height:  896.4m (LIDAR)

Bwlch Grid Reference:  SH 61885 55154 (LIDAR)   

Drop:  9.8m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (July 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Yr Esgair (SH 629 613) – Welsh Highland Sub deletion (74th reclassification)

 

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Yr Esgair (SH 629 613)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Yr Esgair and it is adjoined to the Glyder Fawr group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the A4086 road to its south-west and the A5 road to its east, and has the town of Besethda towards the north.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on a 708m summit height and an estimated c 698m bwlch height, and therefore included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

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 Welsh Highland Sub status is due to LIDAR analysis, resulting in a 708.3m summit height and a 702.0m bwlch height, with these values giving this hill 6.3m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Glyder Fawr

Name:  Yr Esgair

OS 1:50,000 map:  115

Summit Height:  708.3m (LIDAR)

Summit Grid Reference:  SH 62988 61307 (LIDAR)

Bwlch Height:  702.0m (LIDAR)

Bwlch Grid Reference:  SH 62967 61278 (LIDAR)   

Drop:  6.3m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (July 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Esgair Pentanau (SN 846 703) – Welsh Highland Sub addition (73rd reclassification)

Survey post for Esgair Pentanau

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and subsequently confirmed by a Trimble GeoXH 6000 survey; the former conducted by Aled Williams and the latter by Myrddyn Phillips and Aled Williams. 

Esgair Pentanau (SN 846 703)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Esgair Pentanau, and it is adjoined to the Carn yr Hyrddod group of hills, which are situated in the north-western part of South Wales (Region B, Sub-Region B1), and it is positioned with a minor road to its north-east and the B4343 road to its west, and has the town of Rhaeadr Gwy (Rhayader) towards the east.

The contemporary Ordnance Survey 1:25,000 Explorer map gives this hill a 503m summit spot height, with bwlch contouring between 490m – 500m.  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. 

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

When the initial P10 sub list was completed in June 2020 this hill was listed with 8.7m of drop based on analysis of the available 2m DSM LIDAR model.  When new Welsh LIDAR became available in April 2023 this hill was again analysed via LIDAR, now using the more accurate 1m DSM model. 

LIDAR image of Esgair Pentanau (SN 846 703)

LIDAR analysis using 1m DSM gives this hill over 10m of drop and therefore qualifying for Welsh Highland Sub status, and as this hill had now been surveyed with the Trimble GeoXH 6000, it is this result that is being prioritised for this hill. 

The Trimble GeoXH 6000 gathering data at the summit of Esgair Pentanau

The Trimble GeoXH 6000 gathering data at the bwlch of Esgair Pentanau

Therefore, the addition of this hill to Welsh Highland Sub status is due to LIDAR analysis, with confirmation via a subsequent Trimble GeoXH 6000 survey, resulting in a 504.2m summit height and a 493.2m bwlch height, with these values giving this hill 11.0m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Carny yr Hyrddod

Name:  Esgair Pentanau

OS 1:50,000 map:  135, 136, 147

Summit Height:  504.2m (converted to OSGM15)

Summit Grid Reference:  SN 84648 70308

Bwlch Height:  493.2m (converted to OSGM15)

Bwlch Grid Reference:  SN 84472 69977   

Drop:  11.0m 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (July 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pt. 872.3m (SH 658 577) – Welsh Highland Sub deletion (72nd reclassification)

There has been a deletion to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis and subsequently confirmed by a Trimble GeoXH 6000 survey, both conducted by Aled Williams. 

LIDAR image of Pt. 872.3m (SH 658 577)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 872.3m) notation and it is adjoined to the Glyder Fawr group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the A5 road to its north and the A4086 road to its south, and has the village of Capel Curig towards the east.

When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 10m of drop, based on an 873m summit height and an estimated c 863m bwlch height, and therefore included as a Welsh Highland Sub when the drop value of the subs was agreed upon and revised in July 2020. 

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

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

The Trimble GeoXH 6000 gathering data on Pt. 872.3m (SH 658 577).  Photo: Aled Williams

LIDAR analysis gave this hill under 10m of drop required for it to be classified as a Welsh Highland Sub, and as this hill had now been surveyed with the Trimble GeoXH 6000, it is this result that is being prioritised for this hill.

Therefore, the deletion of this hill from Welsh Highland Sub status is due to LIDAR analysis and subsequently confirmed by a Trimble GeoXH 6000 survey, resulting in an 872.3m summit height and an 867.0m bwlch height, with these values giving this hill 5.3m of drop, which is insufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Glyder Fawr

Name:  Pt. 872.3m

OS 1:50,000 map:  115

Summit Height:  872.3m (LIDAR)

Summit Grid Reference:  SH 65867 57758 (LIDAR)

Bwlch Height:  867.0m (LIDAR)

Bwlch Grid Reference:  SH 65876 57793 (LIDAR)   

Drop:  5.3m (LIDAR) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (July 2023)

Mapping Mountains - Hill Reclassifications - Welsh Highlands - Uchafion Cymru

Pen y Castell (SH 724 688) – Welsh Highland Sub addition (71st reclassification)

 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived a combination of an optical level survey conducted by Graham Jackson and Myrddyn Phillips, a Leica RX1250 survey conducted by Alan Dawson and LIDAR analysis conducted by Aled Williams. 

LIDAR image of Pen y Castell (SH 724 688)

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

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Pen y Castell and it is adjoined to the Carnedd Llywelyn group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with a minor road to its east north-east, and the B5106 road and the A470 road farther to its east, and has the village of Llanbedrycennin towards the east.

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

The summit of this hill was surveyed by optical level from its near higher summit on the 9^th April 2010 by Graham Jackson and Myrddyn Phillips and determined to be 2.43m lower.  The higher summit positioned at SH 72187 68880 was subsequently surveyed by Alan Dawson using a Leica RX1250 on the 14^th June 2017, resulting in a 623.516m summit height.  Therefore, the lower summit relative to the higher is 621.086m in height.

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 addition of this hill to Welsh Highland Sub status is due to an optical level survey, a Leica RX1250 survey and LIDAR analysis, resulting in a 621.1m summit height and a 611.0m bwlch height, with these values giving this hill 10.0m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

                                                                                                                                      

The full details for the hill are: 

Group:  Carnedd Llywelyn

Name:  Pen y Castell

OS 1:50,000 map:  115

Summit Height:  621.1m (relative to optical level survey [2.43m lower] from 623.5m higher summit)

Summit Grid Reference:  SH 72434 68874 (LIDAR)

Bwlch Height:  611.0m (LIDAR)

Bwlch Grid Reference:  SH 72374 68895 (LIDAR)   

Drop:  10.0m (relative to optical level survey [2.43m lower] from 623.5m higher summit and LIDAR bwlch) 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (June 2023)