Myrddyn Phillips - Mapping Mountains: Change Register - Welsh Highlands - Uchafion Cymru

Wednesday, 11 January 2017

Change Register - Welsh Highlands - Uchafion Cymru - Welsh Highland Subs

Change Register

Welsh Highlands - Uchafion Cymru

Welsh Highland Subs

All hills in Wales at or above 500m in height with a minimum prominence of 15m; from the 500.5m summit of Moel Bowydd to the 1084.8m summit of Yr Wyddfa

‘Welsh Highlands - Uchafion Cymru’ is a hill list co-authored by Myrddyn Phillips and Aled Williams, and was first announced on the Mapping Mountains site on 4^th November 2015 where a complete breakdown of hill totals was listed by Group. The list then comprised of 630 hills within the main list that met the qualifying criteria with over 100 of these hills making their first known appearance in any form of hill list; emphasising the fact that this listing is the most comprehensive of its kind for this height band of hill in Wales.

The listing originated in 2004 at which time it included a sub hill category for those hills that met the qualifying height but only had 14m or more and below 15m of drop, these are now known as the Welsh Highland Subs and as of the 7th January 2023 been revised with their criteria being all Welsh hills at and above 500m in height with 10m or more and below 15m of drop. Since the listing originated it has developed ever since with over 330 marginal hills having been surveyed using a basic levelling technique. It is now benefiting from the accurate surveys conducted with GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data.

However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded.

In recent years, acronyms or short monikers referring to specific hill lists have become increasingly popular in hill-walking circles, and during the compilation of this list which used to be referred to as the ‘The Welsh 500m P15s’ the authors have used the Welsh word ‘Uchaf (Higher)’ to refer to these hills, with the plural being ‘Uchafion’, since these summits take in the higher tier of the Welsh uplands. For the time being this moniker will be used on the Mapping Mountains site to refer to this class of hill.

It seems fitting that the list of the ‘Welsh Highlands - Uchafion Cymru – Welsh Highland Subs’ should now benefit from a detailed Change Register, and although the hill list in its entirety is not yet published it is prudent for this Change Register to initially detail the changes to this sub category since the November 2015 introduction published on the Mapping Mountains site.

The Change Register to the ‘Welsh Highlands - Uchafion Cymru – Welsh Highland Subs’ appears below with the reclassifications being detailed chronologically in receding order.

Change Register

Welsh Highlands - Uchafion Cymru – Welsh Highland Subs

Pt. 906.2m 906.2m at SH 61983 55146

Gathering data at the summit of Pt. 906.2m (SH 619 551). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status was announced via this Change Register. When the initial P10 sub list was completed in June 2020 this hill was listed as a Welsh Highland Sub with 10.4m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 20.09.98. It was subsequently deleted from sub status due to LIDAR analysis conducted by Aled Williams. Its reinstatement to sub status is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 05.10.24, resulting in a 906.2m summit height and an 896.1m bwlch height, with these values giving this hill 10.1m of drop. Welsh Highland Subs total increases by one and confirmed as 256.

Elidir Fach 794.2m at SH 60377 61341

The summit area of Elidir Fach (SH 603 613). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status was announced via this Change Register. When the initial P10 sub list was completed in June 2020 this hill was listed as a Welsh Highland Sub with 13.5m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 22.05.98. It was subsequently deleted from sub status due to LIDAR analysis conducted by Aled Williams. Its reinstatement to sub status is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 17.08.24, resulting in a 794.2m summit height and a 784.2m bwlch height, with these values giving this hill 10.0m of drop. Welsh Highland Subs total increases by one and confirmed as 255.

Pt. 914.9m 914.9m at SH 65981 58563

Pt. 914.9m (SH 659 585). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status was announced via this Change Register. The only known survey of this hill prior to that conducted with the Trimble GeoXH 6000 was a basic levelling survey conducted by Myrddyn Phillips on the 02.05.99 giving 31ft (9.4m) of drop. Its addition to Welsh Highland Sub status is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 14.08.24, resulting in a 914.9m summit height and a 904.4m bwlch height, with these values giving this hill 10.5m drop. Welsh Highland Subs total increases by one and confirmed as 254.

Pen Tyrau 697.4m at SH 83737 38250

Pen Tyrau (SH 837 382). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status was announced via this Change Register. The status of this hill has a convoluted history as it was originally listed with less than the required 10m minimum drop to qualify for sub status, and then included due to details of a past basic levelling survey, only to be subsequently deleted from sub status due to LIDAR analysis. Its reinstatement is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 28.07.24, resulting in a 697.4m summit height and a 687.4m bwlch height, with these values giving this hill 10.0m drop. Welsh Highland Subs total increases by one and confirmed as 253.

Clipiau Duon 586.3m at SH 90074 22779

LIDAR image of Clipiau Duon (SH 900 227)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 27.01.24. When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on an estimated c 585m summit height and an estimated c 576m bwlch height, with both heights based on interpolation of 5m contouring that appeared on online mapping. Its addition is due to LIDAR analysis conducted by Aled Williams, resulting in a 586.3m summit height and a 576.1m bwlch height, with these values giving this hill 10.2m of drop. Welsh Highland Subs total increases by one and confirmed as 252.

Cefn Tyle Brych 538.5m at SN 90321 01411

LIDAR image of Cefn Tyle Brych (SN 903 014)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 24.01.24. When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 11m of drop, based on a 539m summit height and an estimated c 528m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. Its deletion is due to LIDAR analysis conducted by Aled Williams, resulting in a 538.5m summit height and a 528.7m bwlch height, with these values giving this hill 9.8m of drop. Welsh Highland Subs total decreases by one and confirmed as 251.

Pt. 557.6m 557.6m at SO 02324 82248

LIDAR image of Pt. 557.6m (SO 023 822)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 21.01.24. When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 11m of drop, based on the 558m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and an estimated c 547m bwlch height, based on the 1796ft (547.4m) height that appears on the Ordnance Survey series of Six-Inch maps. Its deletion is due to LIDAR analysis conducted by Aled Williams, resulting in a 557.6m summit height and a 547.8m bwlch height, with these values giving this hill 9.8m of drop. Welsh Highland Subs total decreases by one and confirmed as 252.

Esgair Dafydd 504.5m at SN 83641 45366

LIDAR image of Esgair Dafydd (SN 836 453)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 18.01.24. This hill was originally listed with an estimated c 11m of drop, based on the 505m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and an estimated c 494m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. Its deletion is due to LIDAR analysis conducted by Aled Williams, resulting in a 504.5m summit height and a 494.9m bwlch height, with these values giving this hill 9.5m of drop. Welsh Highland Subs total decreases by one and confirmed as 253.

Pt. 509.8m 509.8m at SN 82700 47937

LIDAR image of Pt. 509.8m (SN 827 479)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 14.01.24. When the initial P10 sub list was completed in June 2020 this hill was not listed as contour configuration did not give it sufficient interpolated drop for it to be included, with the contemporary Ordnance Survey 1:25,000 Explorer map having an uppermost 500m ring contour that also connects with its critical bwlch. Its addition is due to LIDAR analysis conducted by Aled Williams, resulting in a 509.8m summit height and a 499.5m bwlch height, with these values giving this hill 10.3m of drop. Welsh Highland Subs total increases by one and confirmed as 254.

Carreg Wen Fawr 526.0m at SN 82080 62445

LIDAR image of Carreg Wen Fawr (SN 820 624)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 10.01.24. This hill was originally listed with an estimated c 10m of drop, based on the 527m summit spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map and an estimated c 517m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. Its deletion is due to LIDAR analysis conducted by Aled Williams, resulting in a 526.0m summit height and a 516.6m bwlch height, with these values giving this hill 9.4m of drop. Welsh Highland Subs total decreases by one and confirmed as 253.

Graig Fawr 502.4m at SN 77653 68592

LIDAR image of Graig Fawr (SN 776 685)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 07.01.24. When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 8m of drop, based on a 502m summit height and an estimated c 494m bwlch height, based on interpolation of 5m contouring that appeared on online mapping. Its addition is due to LIDAR analysis conducted by Aled Williams, resulting in a 502.4m summit height and a 492.0m bwlch height, with these values giving this hill 10.4m of drop. Welsh Highland Subs total increases by one and confirmed as 254.

Pt. 528.0m 528.0m at SN 81417 70932

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 04.01.24. This hill was originally 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. Its deletion is due to LIDAR analysis conducted by Aled Williams, resulting in a 528.0m summit height and a 518.4m bwlch height, with these values giving this hill 9.6m of drop. Welsh Highland Subs total decreases by one and confirmed as 253.

Trawsallt 564.5m at SN 78298 70193

LIDAR image of Trawsallt (SN 782 701)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 31.12.23. 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. Its addition is due to LIDAR analysis conducted by Aled Williams, resulting in a 564.5m summit height and a 552.8m bwlch height, with these values giving this hill 11.7m of drop. Welsh Highland Subs total increases by one and confirmed as 254.

Pen y Bwlch 499.6m at SN 92901 66972

LIDAR image of Pen y Bwlch (SN 929 669)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 27.12.23. 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. Its deletion is due to LIDAR analysis conducted by Aled Williams, 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 insufficient for it to be classified as a Welsh Highland Sub. Welsh Highland Subs total decreases by one and confirmed as 253.

Foel Ddu 532.1m at SN 85278 79929

LIDAR image of Foel Ddu (SN 852 799)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 21.12.23. 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. Its addition to Welsh Highland Sub status is due to LIDAR analysis conducted by Aled Williams, resulting in a 532.1m summit height and a 520.9m bwlch height, with these values giving this hill 11.2m of drop. Welsh Highland Subs total increases by one and confirmed as 254.

Esgair Neint 535.5m at SN 78508 80178

LIDAR image of Esgair Neint (SN 785 801)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 16.12.23. 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. 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. Its addition to Welsh Highland Sub status is due to LIDAR analysis conducted by Aled Williams, resulting in a 535.5m summit height and a 525.5m bwlch height, with these values giving this hill 10.0m of drop. Welsh Highland Subs total increases by one and confirmed as 253.

Llechwedd Diflas 513.4m at SN 78935 93043

LIDAR image of Llechwedd Diflas (SN 789 930)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 12.12.23. 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. Its deletion from Welsh Highland Sub status is due to LIDAR analysis conducted by Aled Williams, resulting in a 513.4m summit height and a 503.8m bwlch height, with these values giving this hill 9.5m of drop. Welsh Highland Subs total decreases by one and confirmed as 252.

Bryn Glas 515.9m at SN 76971 82536

LIDAR image of Bryn Glas (SN 769 825)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 08.12.23. 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. Its addition to Welsh Highland Sub status is due to full LIDAR coverage analysis conducted by Aled Williams, resulting in a 515.9m summit height and a 505.3m bwlch height, with these values giving this hill 10.6m of drop. Welsh Highland Subs total increases by one and confirmed as 253.

Llechwedd Crin 536.2m at SN 81384 92266

LIDAR image of Llechwedd Crin (SN 813 922)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 03.12.23. The hill was originally 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. Its addition to Welsh Highland Sub status is due to LIDAR analysis conducted by Aled Williams, resulting in a 536.2m summit height and a 525.6m bwlch height, with these values giving this hill 10.6m of drop. Welsh Highland Subs total increases by one and confirmed as 252.

Pt. 505.8m 505.8m at SN 78575 59899

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

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 16.11.23. The hill was previously 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. Its addition to Welsh Highland Sub status is due to LIDAR analysis conducted by Aled Williams, resulting in a 505.8m summit height and a 492.4m bwlch height, with these values giving this hill 13.5m of drop. Welsh Highland Subs total increases by one and confirmed as 251.

Pt. 516.9m 516.9m at SN 75493 62086

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

The reclassification of this hill to Welsh Highland P15 status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 07.11.23. The hill was previously listed as a Welsh Highland P15 due to the 517m summit spot height and a 502m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. It was then reclassified to a Welsh Highland Sub with an estimated c 14m of drop due to a Trimble GeoXH 6000 summit survey and interpolation of bwlch contouring on the interactive mapping hosted on the OS Maps website. Its reinstatement and reclassification to Welsh Highland P15 status is due to LIDAR analysis conducted by Aled Williams, resulting in a 516.9m summit height and a 501.0m bwlch height, with these values giving this hill 15.8m of drop. Welsh Highland Subs total decreases by one and confirmed as 250.

Pt. 526.8m 526.8m at SN 74595 61119

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

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 03.11.23. The hill was previously listed as a Welsh Highland P15 due to contouring on the interactive mapping 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. Its reclassification to Welsh Highland Sub status is due to LIDAR bwlch analysis conducted by Aled Williams, resulting in a 526.8m summit height and a 512.0m bwlch height, with these values giving this hill 14.8m of drop. Welsh Highland Subs total increases by one and confirmed as 251.

Esgair Neint 538.1m at SN 78369 80073

LIDAR image of Esgair Neint (SN 783 800)

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 30.10.23. The hill was previously listed as a Welsh Highland P15 due to a 49½ft/15.1m basic levelling survey conducted by Myrddyn Phillips on the 24.09.04. Its reclassification from Welsh Highland P15 status is due to LIDAR analysis conducted by Aled Williams, resulting in a 538.1m summit height and a 523.6m bwlch height, with these values giving this hill 14.4m of drop. Welsh Highland Subs total increases by one and confirmed as 250.

Pt. 557.5m 557.5m at SN 79410 81689

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

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 26.10.23. The hill was previously listed as a Welsh Highland P15 due to a 50ft/15.2m basic levelling survey conducted by Myrddyn Phillips on the 24.09.04. Its reclassification from Welsh Highland P15 status is due to LIDAR analysis conducted by Aled Williams, resulting in a 557.5m summit height and a 543.1m bwlch height, with these values giving this hill 14.4m of drop. Welsh Highland Subs total increases by one and confirmed as 249.

Ochr Llygnant 550.4m at SN 79677 91711

LIDAR image of Ochr Llygnant (SN 796 917)

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 22.10.23. The hill was previously listed as a Welsh Highland P15 due to a 49½ft/15.1m basic levelling survey conducted by Myrddyn Phillips on the 03.10.05. Its reclassification from Welsh Highland P15 status is due to LIDAR analysis conducted by Aled Williams, resulting in a 550.4m summit height and a 536.0m bwlch height, with these values giving this hill 14.4m of drop. Welsh Highland Subs total increases by one and confirmed as 248.

Foel Fach 503.8m at SN 76446 93126

LIDAR image of Foel Fach (SN 764 931)

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a retrospective Hill Reclassifications post published on the 18.10.23. The hill was previously listed as a Welsh Highland P15 due to a 50ft/15.2m basic levelling survey conducted by Myrddyn Phillips on the 01.11.05. Its reclassification from Welsh Highland P15 status is due to LIDAR analysis conducted by Aled Williams, resulting in a 503.8m summit height and a 489.2m bwlch height, with these values giving this hill 14.7m of drop. Welsh Highland Subs total increases by one and confirmed as 247.

Pt. 686.3m 686.3m at SH 73642 13623

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 12.10.23. 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. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 246.

Pt. 657.9m 657.9m at SH 85683 20921

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 08.10.23. 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. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 247.

Pt. 844.2m 844.2m at SH 86926 24690

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

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 03.10.23. 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. 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. Its addition 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. Welsh Highland Subs total increases by one and confirmed as 248.

Pt. 505.5m 505.5m at SH 96714 19988

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 27.09.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 247.

Hen Gerrig 518.1m at SH 95070 18770

LIDAR image of Hen Gerrig (SH 950 187)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 24.09.23. 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. Its addition 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. Welsh Highland Subs total increases by one and confirmed as 248.

Cerrig Duon 549.3m at SJ 12833 38497

LIDAR image of Cerrig Duon (SJ 128 384)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 20.09.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 247.

Pt. 568.7m 568.7m at SJ 13353 39284

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 16.09.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 248.

Bryn Ceffyl 506.7m at SH 78639 37135

LIDAR image of Bryn Ceffyl (SH 786 371)

Pt. 510.0m 510.0m at SH 81962 31463

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

Pt. 510.8m 510.8m at SH 777218 24611

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

Graig Fach 511.3m at SH 79263 24920

LIDAR image of Graig Fach (SH 792 249)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 17.08.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 246.

Y Ddau Faen Llwyd 537.3m at SH 80456 31074

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 10.08.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 247.

Pt. 590.9m 590.9m at SH 77617 24963

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 04.08.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 248.

Pen Tyrau 697.8m at SH 83744 38244

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

LIDAR image of Pen Tyrau (SH 837 382)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 29.07.23. 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 an 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 249.

Pt. 906.2m 906.2m at SH 61982 55146

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

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23, with a retrospective Hill Reclassifications post published on the 22.07.23. 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. Its deletion 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. Welsh Highland Subs total decreases by one and confirmed as 250.

Yr Esgair 708.3m at SH 62988 61307

LIDAR image of Yr Esgair (SH 629 613)

Esgair Pentanau 504.2m at SN 84648 70308

The summit of Esgair Pentanau (SN 846 703)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains on the 04.06.23 when this Change Register was updated, with the survey post published on the 05.07.23 and the retrospective Hill Reclassifications post published on the 08.07.23. 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, resulting in it having over 10m of drop. This hill has subsequently been surveyed with the Trimble GeoXH 6000 resulting in a 504.2m summit height and a 493.2m bwlch height, with these values giving this hill 11.0m of drop. Welsh Highland Subs total increases by one and confirmed as 252.

Pt. 872.3m 872.3m at SH 65867 57758

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

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. With the post detailing the survey of this hill published on Mapping Mountains on the 18.04.23, and a retrospective Hill Reclassifications post published on the 01.07.23. The hill was listed as a sub with an estimated c 10m of drop based on an 873m summit height and an estimated c 863m bwlch height. Its deletion is due to LIDAR analysis and subsequent confirmation from a Trimble GeoXH survey, both conducted by Aled Williams, resulting in an 872.3m summit height and an 867.0m bwlch height, with these values giving this hill 5.3m of drop. Welsh Highland Subs total decreases by one and confirmed as 251.

Pen y Castell 621.1m at SH 72434 68874

LIDAR image of Pen y Castell (SH 724 688)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The summit of this hill was surveyed by optical level from its near higher summit on the 09.04.10 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 14.06.17, resulting in a 623.516m summit height. Therefore, the lower summit relative to the higher is 621.086m in height. An accurate height and position of the bwlch was subsequently determined by LIDAR analysis conducted by Aled Williams, resulting in a 621.1m summit height and a 611.0m bwlch height, with these values giving this hill 10.0m of drop. Welsh Highland Subs total increases by one and confirmed as 252.

Craig yr Ysfa 864.3m at SH 69232 63638

LIDAR image of Craig yr Ysfa (SH 692 636)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. When the initial P10 sub list was completed in June 2020 this hill was listed as a Welsh Highland Sub with 12.0m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 04.06.98. Its deletion is due to LIDAR analysis, resulting in an 864.3m summit height and an 855.0m bwlch height, with these values giving this hill 9.2m of drop. Welsh Highland Subs total decreases by one and confirmed as 251.

Carnedd Fach 965.1m at SH 65808 62620

LIDAR image of Carnedd Fach (SH 658 626)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. When the initial P10 sub list was completed in June 2020 this hill was listed as a Welsh Highland Sub with an estimated c 12m of drop, based on a 966m summit height and an estimated c 954m bwlch height. Its deletion is due to LIDAR analysis, resulting in a 965.1m summit height and a 956.2m bwlch height, with these values giving this hill 8.9m of drop. Welsh Highland Subs total decreases by one and confirmed as 252.

Pt. 585.6m 585.6m at SJ 13031 32635

LIDAR image of Pt. 585.6m (SJ 130 326)

The reclassification of this hill from Welsh Highland P15 status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with 15m of drop, based on the 587m summit spot height and 572m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map. Its reclassification to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 585.6m summit height and a 571.5m bwlch height, with these values giving this hill 14.15m of drop. Welsh Highland Subs total decreases by one and confirmed as 253.

Pt. 576.0m 576.0m at SH 55928 47521

LIDAR image of Pt. 576.0m (SH 559 475)

The reclassification of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with an estimated c 14m of drop, based on the 576m summit spot height that appeared on a variety of interactive mapping; including the WalkLakes website, the non-contour Vector Map Local hosted on the Geograph website and the Master Map website, and an estimated c 562m bwlch height based on interpolation of 5m contouring between 560m – 565m that appeared on the OS Maps website. Its reclassification to Welsh Highland P15 status is due to LIDAR analysis, resulting in a 576.0m summit height and a 560.4m bwlch height, with these values giving this hill 15.6m of drop. Welsh Highland Subs total decreases by one and confirmed as 254.

Elidir Fach 794.5m at SH 60378 61339

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

LIDAR image of Elidir Fach (SH 603 613)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. When the initial P10 sub list was completed in June 2020 this hill was listed as a Welsh Highland Sub with 13.5m of drop, based on a basic levelling survey conducted by Myrddyn Phillips on the 22.05.98, and listed with an estimated c 800m summit height relative to its bwlch height, and a 786m bwlch height, with the latter based on detail on the enlarged-scale Ordnance Survey map hosted on the coflein.gov.uk website. Its deletion is due to LIDAR analysis, resulting in a 794.5m summit height and a 784.7m bwlch height, with these values giving this hill 9.8m of drop. Welsh Highland Subs total decreases by one and confirmed as 255.

Pt. 563.0m 563.0m at SH 63821 55162

Pt. 563.0m (SH 638 551). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. Initial LIDAR analysis gave the drop of this hill close to 10.0m and this has now been confirmed with latest available LIDAR. With its status subsequently confirmed by a Trimble GeoXH 6000 survey conducted by Aled Williams, and it is this result that is being prioritised, resulting in a 563.0m summit height and a 552.8m bwlch height, with these values giving this hill 10.2m of drop. Welsh Highland Subs total increases by one and confirmed as 256.

Llechwedd Du 511.4m at SH 89360 44629

LIDAR image of Llechwedd Du (SH 893 446)

The reclassification of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with an estimated c 16m of drop, based on an estimated c 511m summit height from interpolation of the uppermost 510m contour that appeared on the interactive mapping hosted on the OS Maps website and the 495m bwlch spot height that appears on the Ordnance Survey 1:25,000 Explorer map. Its reclassification to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 511.4m summit height and a 497.1m bwlch height, with these values giving this hill 14.3m of drop. Welsh Highland Subs total increases by one and confirmed as 255.

Foel Fach 544.5m at SH 94433 42381

LIDAR image of Foel Fach (SH 944 423)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was not included in the initial P10 sub list when it was completed in June 2020 as with a 544m summit height and an estimated c 536 bwlch height, based on enlarged scale Ordnance Survey mapping available online, these values gave this hill an estimated c 8m of drop. Its addition to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 544.5m summit height and a 534.4m bwlch height, with these values giving this hill 10.1m of drop. Welsh Highland Subs total increases by one and confirmed as 254.

Pt. 592.5m 592.5m at SH 64805 47425

LIDAR image of Pt. 592.5m (SH 648 474)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. This hill was not included in the initial P10 sub list when it was completed in June 2020 as with a 591m summit height and an estimated c 582m bwlch height, based on enlarged scale Ordnance Survey mapping available online, these values gave this hill an estimated c 9m of drop. Its addition to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 592.5m summit height and a 582.2m bwlch height, with these values giving this hill 10.3m of drop. Welsh Highland Subs total increases by one and confirmed as 253.

Pt. 571.3m 571.3m at SH 66153 49880

LIDAR image of Pt. 571.3m (SH 661 498)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with an estimated c 8m of drop, based on an estimated c 572m summit height and an estimated c 564m bwlch height, with both heights based on interpolation of 10m contouring. Its addition to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 571.3m summit height and a 560.9m bwlch height, with these values giving this hill 10.4m of drop. Welsh Highland Subs total increases by one and confirmed as 252.

Pt. 531.3m 531.3m at SH 65884 46911

LIDAR image of Pt. 531.3m (SH 658 469)

The addition of this hill to Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with an estimated c 8m of drop, based on the 531m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 523m bwlch height, based on interpolation of 10m contouring between 520m – 530m. Its addition to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 531.3m summit height and a 520.6m bwlch height, with these values giving this hill 10.6m of drop. Welsh Highland Subs total increases by one and confirmed as 251.

Cefn y Cerrig 502.0m at SH 67480 54509

Cefn y Cerrig (SH 674 545) (Photo: Aled Williams)

The survey post announcing the addition of this hill to Welsh Highland Sub status was published on Mapping Mountains on the 12.04.23, with a retrospective Hill Reclassifications post published on the 05.05.23. The hill was initially listed with an estimated c 9m of drop, based on the 502m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 493m bwlch height, based on interpolation of 10m contouring between 490m – 500m. Its addition is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 25.02.23, resulting in a 502.0m summit height and a 491.2m bwlch height, with these values giving this hill 10.8m of drop. Welsh Highland Subs total increases by one and confirmed as 250.

Cefn Blaen Merin 552.9m at SN 81271 81064

LIDAR image of Cefn Blaen Merin (SN 812 810)

The reclassification of this hill from Welsh Highland P15 status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with 15.1m of drop, based on a 49½ft/15.1m basic levelling survey conducted by Myrddyn Phillips on the 20.11.05. Its reclassification to Welsh Highland Sub status is due to LIDAR analysis, resulting in a 552.9m summit height and a 538.1m bwlch height, with these values giving this hill 14.8m of drop. Welsh Highland Subs total increases by one and confirmed as 249.

Bryn Llochesau 563.8m at SN 82447 80795

LIDAR image of Bryn Llochesau (SN 824 807)

The deletion of this hill from Welsh Highland Sub status was announced on Mapping Mountains with a New Welsh LIDAR post published on the 27.03.23. The hill was previously listed with an estimated c 10m of drop, based on the 1849ft (563.6m) imperial summit height that appeared on the Ordnance Survey series of Six-Inch maps (rounded up to 564m on the Ordnance Survey 1:50,000 Landranger map) and an estimated c 554m bwlch height based on interpolation of 10m contouring between 550m – 560m. Its deletion is due to LIDAR analysis, resulting in a 563.8m summit height and a 554.1m bwlch height, with these values giving this hill 9.7m of drop. Welsh Highland Subs total decreases by one and confirmed as 248.

Craig Eigiau 688.4m at SH 71280 64670

Craig Eigiau (SH 712 646) (Photo: Aled Williams)

The survey post announcing the addition of this hill to Welsh Highland Sub status was published on Mapping Mountains on the 11.03.23, with a retrospective Hill Reclassifications post published on the 06.04.23. The hill was previously listed with 9.7m of drop, based on a 688.1m summit height and a 678.4m bwlch height derived from LIDAR analysis conducted by Aled Williams. Its addition is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 28.01.23, resulting in a 688.4m summit height and a 678.2m bwlch height, with these values giving this hill 10.2m of drop. Welsh Highland Subs total increases by one and confirmed as 249.

Pt. 524.3m 524.3m at SH 66117 45783

Pt. 524.3m (SH 661 457) (Photo: Aled Williams)

The survey post announcing the addition of this hill to Welsh Highland Sub status was published on Mapping Mountains on the 24.02.23, with a retrospective Hill Reclassifications post published on the 03.04.23. The hill was not included when the initial list of P10 subs was completed in June 2020, as the contemporary Ordnance Survey 1:25,000 Explorer map only has two small uppermost 520m contours without any summit or bwlch spot height. However, the hill was surveyed by Aled Williams on the 21.01.23 using the Trimble GeoXH 6000. Upon investigation it was judged that the natural drop of this hill exceeds 10m, with the area of the bwlch complicated by a dam and leat. The conclusion being that the natural bwlch was either under the dam or further north past the leat, but for now we are taking the bottom of the dam as the critical point of the bwlch, resulting in a 524.3m summit height and a 513.5m bwlch height, with these values giving this hill 10.7m of drop. Welsh Highland Subs total increases by one and confirmed as 248.

Craig Ysgafn 688.3m at SH 65973 44394

Craig Ysgafn (Photo: Aled Williams)

The survey post announcing the addition of this hill to Welsh Highland Sub status was published on Mapping Mountains on the 24.02.23, with a retrospective Hill Reclassifications post published on the 31.03.23. The hill was previously listed with 9.9m of drop, based on a 687.7m summit height and a 677.8m bwlch height derived from LIDAR analysis conducted by Aled Williams, with a basic levelling survey conducted by Myrddyn Phillips on the 18.04.98 giving 10.0m of drop. Its addition is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 21.01.23, resulting in a 688.3m summit height and a 678.0m bwlch height, with these values giving this hill 10.3m of drop. Welsh Highland Subs total increases by one and confirmed as 247.

Tryfan 910.8m at SH 66393 59332

Tryfan (SH 663 593) (Photo: Aled Williams)

The survey post announcing the deletion of this hill from Welsh Highland Sub status was published on Mapping Mountains on the 09.02.23, with a retrospective Hill Reclassifications post published on the 22.03.23. The hill was listed as a sub with 10.0m of drop based on a basic levelling survey conducted by Myrddyn Phillips on the 01.05.98. Its deletion is due to a Trimble GeoXH 6000 survey conducted by Aled Williams on the 26.12.22, resulting in a 910.8m summit height and a 901.6m bwlch height, with these values giving this hill 9.2m of drop. Welsh Highland Subs total decreases by one and confirmed as 246.

Welsh Highland Subs total confirmed as 247.

7^th January 2023 – Announcement of revision to Welsh Highland Subs criteria to now include all Welsh hills at and above 500m in height with 10m or more and below 15m of drop

19^th July 2020 – Agreement to include Welsh Highland Subs at and above 500m in height with 10m or more and below 15m of drop

June 2020 – Initial version completed of the Welsh Highland Subs at and above 500m in height with 10m or more and below 15m of drop

Pt. 581.7m 581.7m at SJ 08664 37360

Pt. 581.7m (SJ 086 373)

The survey post announcing the deletion of this hill from 500m Sub-Uchaf status was published on Mapping Mountains on the 25.02.21, with a retrospective Hill Reclassifications post published on the 05.06.21. The hill was originally not classified and its addition to 500m Sub-Uchaf status was due to detail on contemporary maps produced from Ordnance Survey data, with a 582m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 568m bwlch height based on interpolation of 5m contouring between 565m – 570m on the OS Maps website, with these values giving this hill an estimated c 14m of drop. Its deletion from sub status is due to a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams on the 26.11.20, resulting in a 581.7m summit height and a 568.7m bwlch height, with these values giving this hill 13.0m of drop. 500m Sub-Uchaf total decreases by one and confirmed as 28.

Pt. 577m 577m at SN 80889 76890

DUE TO SUBSEQUENT LIDAR ANALYSIS THIS HILL HAS BEEN RECLASSIFIED FROM WELSH HIGHLAND SUB STATUS TO WELSH HIGHLAND P15 STATUS

The Hill Reclassifications post announcing the addition of this hill to 500m Sub-Uchaf status was published on Mapping Mountains on the 27.08.20. The hill was previously not classified and its addition to 500m Sub-Uchaf status is due to detail on contemporary maps produced from Ordnance Survey data, with a 577m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and an estimated c 563m bwlch height based on interpolation of 5m contouring between 560m – 565m on the OS Maps website, with these values giving this hill an estimated c 14m of drop. 500m Sub-Uchaf total increases by one and confirmed as 29.

Pt. 522.2m 522.2m at SJ 13614 36370

LIDAR image of Pt. 522.2m (SJ 136 363)

The Hill Reclassifications post announcing the reinstatement of this hill to 500m Sub-Uchaf status was published on Mapping Mountains on the 05.08.20. The hill was originally listed as a 500m Sub-Uchaf with 14m of drop based on the 522m summit spot height and 508m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map. It was subsequently deleted from this status due to DTM LIDAR analysis and it is now reinstated due to 1m DSM LIDAR analysis conducted by Aled Williams, resulting in a 522.2m summit height and a 508.2m bwlch height, with these values giving this hill 14.0m of drop. 500m Sub-Uchaf total increases by one and confirmed as 28.

Pt. 576m 576m at SH 55928 47522

DUE TO SUBSEQUENT LIDAR ANALYSIS THIS HILL HAS BEEN RECLASSIFIED FROM WELSH HIGHLAND SUB STATUS TO WELSH HIGHLAND P15 STATUS

The Hill Reclassifications post announcing the addition of this hill to 500m Sub-Uchaf status was published on Mapping Mountains on the 28.07.20. The hill was previously not classified and its addition to 500m Sub-Uchaf status is due to detail on contemporary maps produced from Ordnance Survey data, with a 576m summit spot height that appears on the Magic Maps and WalkLakes websites, and the Ordnance Survey non-contour Vector Map Local hosted on the Geograph website, and an estimated c 562m bwlch height based on interpolation of 5m contouring between 560m – 565m on the OS Maps website, with these values giving this hill an estimated c 14m of drop. 500m Sub-Uchaf total increases by one and confirmed as 27.

Pt. 582m 582m at SJ 08663 37377

Pt. 582m (SJ 086 373)

The Hill Reclassifications post announcing the addition of this hill to 500m Sub-Uchaf status was published on Mapping Mountains on the 24.07.20. The hill was previously not classified and its addition to 500m Sub-Uchaf status is due to detail on contemporary maps produced from Ordnance Survey data, with a 582m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 568m bwlch height based on interpolation of 5m contouring between 565m – 570m on the OS Maps website, with these values giving this hill an estimated c 14m of drop. This hill has subsequenty been surveyed with the Trimble GeoXH 6000 and has been deleted from 500m Sub-Uchaf status (see above). 500m Sub-Uchaf total increases by one and confirmed as 26.

Carreg Gwalch 546.0m at SH 64238 55249

Gathering data at the summit of Carreg Gwalch (SH 642 552). Photo: Aled Williams

The addition of this hill to Welsh Highland Sub status appeared in a Hill Reclassifications post published on Mapping Mountains on the 09.07.20. The hill was previously not classified and its addition is due to detail on contemporary maps produced from Ordnance Survey data, with subsequent confirmation from LIDAR analysis and a Trimble GeoXH 6000 survey conducted by Aled Williams, resulting in a 546.0m summit height and a 531.2m bwlch height, with these values giving this hill 14.7m of drop. Welsh Highland Sub total increases by one and confirmed as 25.

Moel Darren 510.0m at SH 95221 41372

Moel Darren (SH 952 413)

The reclassification of this hill to 500m Sub-Uchaf status appeared in a Hill Reclassifications post published on Mapping Mountains on the 06.06.20. The hill was previously listed as an Uchaf based on a basic levelling survey conducted by Myrddyn Phillips on the 01.05.04 which resulted in 51½ft / 15.7m of drop. Its reclassification to 500m Sub-Uchaf status is due to a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams on the 19.01.20, resulting in a 510.0m summit height and a 495.4m bwlch height, with these values giving this hill 14.6m of drop. 500m Sub-Uchaf total increases by one and confirmed as 24.

Llechwedd Du c 511m at SH 89377 44652

THIS HILL HAS SUBSEQUENTLY BEEN RECLASSIFIED TO WELSH HIGHLAND SUB STATUS

The reclassification of this hill from 500m Sub-Uchaf to Uchaf status was announced on Mapping Mountains when the Hill Reclassifications post was published on the 19.12.19. The hill was previously listed as a 500m Sub-Uchaf with 14m of drop based on the 509m summit and 495m bwlch spot heights that appear on contemporary Ordnance Survey maps, and its reclassification to Uchaf status is due to interpolation of its 510m uppermost contour on the OS Maps website coupled with the 495m bwlch spot height, resulting in an estimated c 16m of drop. 500m Sub-Uchaf total decreases by one and confirmed as 23.

Pt. 524.3m 524.3m at SN 88113 16370

Pt. 524.3m (SN 881 163)

This hill’s reclassification from 500m Sub-Uchaf to Uchaf status was announced on Mapping Mountains when the survey post was published on the 16.10.19, with a Hill Reclassifications post appearing on Mapping Mountains on the 20.10.19. The hill was previously listed as a 500m Sub-Uchaf due to LIDAR analysis conducted by Aled Williams, and its reclassification to Uchaf status is due to a survey with the Trimble GeoXH 6000 resulting in a 524.3m summit height positioned at SN 88113 16370 and a 538.4m bwlch height positioned at SN 87423 16132, with these values giving this hill 15.0m of drop. 500m Sub-Uchaf total decreases by one and confirmed as 24.

Cefn Cwm Coel 503.0m at SN 89142 64733

Cefn Cwm Coel (SN 891 647) has now been deleted from 500m Sub-Uchaf status

The deletion of this hill from 500m Sub-Uchaf status was announced on Mapping Mountains on the 29.05.19, with a Hill Reclassifications post published on Mapping Mountains on the 16.07.19. The hill was previously listed as an Uchaf with 15m of drop based on the 504m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer and the 489m bwlch spot height that appears on the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map. This hill was then reclassified to 500m Sub-Uchaf status due to LIDAR bwlch analysis conducted by Aled Williams, resulting in a 489.6m bwlch height giving the hill 14m of drop. This hill has now been surveyed with the Trimble GeoXH 6000 on the 27.02.19 by Myrddyn Phillips, resulting in a 503.0m summit height and a 489.6m bwlch height, with these values giving this hill 13.4m of drop, which is insufficient for continued 500m Sub-Uchaf status. 500m Sub-Uchaf total decreases by one and confirmed as 25.

Cribau 501.9m at SH 73264 64129

The summit of Cribau (SH 732 641)

This hill’s reclassification to 500m Sub-Uchaf status was announced on Mapping Mountains on the 21.05.19, with the Hill Reclassification post appearing on Mapping Mountains on the 20.06.19; prior to this the hill was listed as an Uchaf with 15.5m of drop based on a basic levelling survey conducted by Myrddyn Phillips on the 13.12.05. This hill’s reclassification is due to a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams resulting in a 501.9m summit height and 487.3m bwlch height, with these values giving this hill 14.6m of drop, which is insufficient for its continued inclusion as an Uchaf. 500m Sub-Uchaf total increases by one and confirmed as 26.

Pt. 516.3m 516.3m at SN 75504 62132

THIS HILL HAS SUBSEQUENTLY BEEN RECLASSIFIED TO WELSH HIGHLAND P15 STATUS

Pt. 516.3m (SN 755 621) has now been reclassified to a 500m Sub-Uchaf

This hill’s reclassification to 500m Sub-Uchaf status was announced on Mapping Mountains on the 16.09.18, with the Hill Reclassification post appearing on Mapping Mountains on the 13.10.18; prior to this the hill was listed as an Uchaf with 15m of drop based on the 517m summit and 502m bwlch spot heights that appear on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website. This hill’s reclassification is due to a Trimble GeoXH 6000 survey and interpolation of the 5m bwlch contouring on OS Maps, resulting in a 516.3m (converted to OSGM15) summit height and a c 502m bwlch height, with these values giving this hill c 14m of drop, which is insufficient for its continued inclusion as an Uchaf. 500m Sub-Uchaf total increases by one and confirmed as 26.

Carreg yr Ast 579.3m at SN 87717 59184

This hill’s inclusion as a 500m Sub-Uchaf was announced via Mapping Mountains on the 19.07.17; prior to this the hill had not been classified. Its addition to the 500m Sub-Uchaf ranks is due to analysis of LIDAR data by Aled Williams, with the resulting summit height of 579.3m (converted to OSGM15) and bwlch height of 564.3m (converted to OSGM15) being sufficient for 500m Sub-Uchaf status with the hill having 14.94m of drop. 500m Sub-Uchaf total increases by one and confirmed as 25.

Cefn Ffos yr Ewig 547.5m at SN 83243 69235

LIDAR image of Cefn Ffos yr Ewig (SN 832 692)

This hill’s deletion from 500m Sub-Uchaf status was announced on Mapping Mountains on the 21.05.17, with the hill previously listed in this sub category with 14m of drop based on a 46ft 6˝ (14.2m) basic levelling survey (BLS) conducted by Myrddyn Phillips on 08.08.05. This BLS was conducted from the bwlch positioned at SN 83373 70381 to the 549m map heighted summit of Cnapyn Drawsffos at SN 83443 70639, and as the Ordnance Survey also give a 549m summit spot height to Cefn Ffos yr Ewig at SN 83243 69235 the basic levelling survey meant that the lower of these two hills qualified as a 500m Sub-Uchaf with just over 14m of drop. To complicate matters when the basic levelling survey was conducted the summit of Banc Steffan positioned at SN 83357 70017 and which is situated between Cnapyn Drawsffos and Cefn Ffos yr Ewig was not given a spot height on maps of the day and had an uppermost 540m ring contour, therefore whichever summit out of the three is higher would qualify as an Uchaf and the higher of the other two lower summits would, according to the basic levelling survey, qualify as a 500m Sub-Uchaf. This hill’s subsequent deletion from 500m Sub-Uchaf status is due to LIDAR analysis conducted by Aled Williams, with the resulting summit height of 547.5m and bwlch height of 534.3m being insufficient for this hill’s retention in this sub category with only 13.3m of drop. 500m Sub-Uchaf total decreases by one but remains as 24. This figure remains at it was prior to this hill’s deletion as the hill was missed from this sub category when the Introduction to the list was published on Mapping Mountains in November 2015.

Pt. 522.0m 522.0m at SJ 13615 36369

The announcement of this hill’s deletion from the 500m Sub-Uchaf ranks was announced on Mapping Mountains on the 22.04.17, with the hill previously listed in this sub category with 14m of drop based on the 522m summit spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps and the 508m bwlch spot height on the Ordnance Survey 1:25,000 Explorer map. This hill’s subsequent deletion from 500m Sub-Uchaf status is due to analysis of LIDAR data by Aled Williams, with the resulting summit height of 522.0m (converted to OSGM15) and bwlch height of 508.2m (converted to OSGM15) being insufficient for its retention in this sub category with only 13.8m of drop. 500m Sub-Uchaf total decreases by one and confirmed as 24.

Pt. 524.0m 524.0m at SN 88113 16370

THIS HILL HAS SUBSEQUENTLY BEEN SURVEYED WITH THE TRIMBLE GEOXH 6000 AND RECLASSIFIED TO UCHAF STATUS

Pt. 524.3m (SN 881 163)

This hill’s inclusion as a 500m Sub-Uchaf was announced via Mapping Mountains on the 15.04.17; prior to this the hill had not been classified. Its addition to the 500m Sub-Uchaf ranks is due to analysis of LIDAR data by Aled Williams, with the resulting summit height of 524.0m (converted to OSGM15) and bwlch height of 509.4m (converted to OSGM15) being sufficient for 500m Sub-Uchaf status with the hill having 14.6m of drop. 500m Sub-Uchaf total increases by one and confirmed as 25.

Drum Boeth 523.4m at SH 72020 46289

Gathering data with the Trimble GeoXH 6000 at the summit of Drum Boeth (SH 720 462)

The announcement of this hill’s reclassification to Uchaf status was made on the Mapping Mountains site on the 01.04.17, with the hill previously listed as a 500m Sub-Uchaf based on a 48ft 6″ (14.8m) drop value produced by a basic levelling survey conducted by Myrddyn Phillips on the 27.10.05. This hill’s reclassification from 500m Sub-Uchaf status is due to analysis of LIDAR data by Aled Williams, with the resulting summit height of 523.4m and bwlch height of 508.3m giving this hill sufficient drop to be included as an Uchaf, the hill has subsequently been surveyed with the Trimble GeoXH 6000 on 08.04.17 resulting in a 523.4m (converted to OSGM15) summit height and a 508.1m (converted to OSGM15) bwlch height, with these values giving this hill 15.2m of drop. 500m Sub-Uchaf total decreases by one and confirmed as 24.

Cefn Cwm Coel 504m at SN 89101 64730

Cefn Cwm Coel is situated in the Elenydd

This hill’s reclassification to 500m Sub-Uchaf was announced Mapping Mountains on the 12.02.17, with the hill previously listed as an Uchaf with 15m of drop based on the Ordnance Survey 504m summit spot height on the 1:50,000 Landranger, 1:25,000 Explorer and on the enlarged mapping hosted on the Geograph website, with the latter map showing a 489m bwlch spot height. This hill’s reclassification from an Uchaf to a 500m Sub-Uchaf is due to analysis of LIDAR bwlch data by Aled Williams, with the resulting height of 489.6m when combined with the 504m summit spot height only giving this hill 14m of drop, which is insufficient for continued Uchaf status. This hill has subequently been surveyed with the Trimble GeoXH 6000 resulting in a 503.0m summit and 489.6m bwlch height, with these values giving this hill 13.4m of drop. 500m Sub-Uchaf total increases by one and confirmed as 25.

Cefn Onneu 530.0m at SO 17112 15692

The reclassification of this hill was announced on the Mapping Mountains site on 31.01.17, with the hill previously listed as an Uchaf with c 15m of drop based on an estimated summit height of c 530m and an estimated bwlch height of c 515m. This hill has been reclassified from an Uchaf to a 500m Sub-Uchaf from LIDAR data analysed by Aled Williams, with the resulting heights being 530m summit and 515.6m bwlch, giving this hill 14.4m of drop which is insufficient to retain its Uchaf status. 500m Sub-Uchaf total increases by one and confirmed as 24.

Pt. 637.1m 637.1m at SO 26709 32261

Pt. 637.1m (SO 267 322) is now reclassified to a 500m Sub-Uchaf

This reclassification was announced on the Mapping Mountains site on 30.11.16, with the hill previously listed as an Uchaf with c 15m of drop based on the 637m summit spot height on Ordnance Survey maps and an estimated bwlch height based on contour interpolation of c 622m. This hill was reclassified from an Uchaf to a 500m Sub-Uchaf from LIDAR data analysed by Aled Williams, who had analysed this hill’s data independent of Joe Nuttall who was the first person to scrutinise this hill with LIDAR data, both found that the hill was given less than 15m of drop with Aled’s analysis producing a 637.4m summit and 622.7m bwlch height, with these values giving the hill only 14.7m of drop. This hill has subsequently been surveyed with the Trimble GeoXH 6000 on the 28.09.17 resulting in a 637.1m summit height and a 622.5m bwlch height, with these values confirming that this hill has less than 15m of drop which is insufficient to retain its Uchaf status. 500m Sub-Uchaf total increases by one and confirmed as 23.

Waun Goch 520.8m at SN 84142 94373

The Trimble GeoXH 6000 gathering data at the summit of Waun Goch (SN 841 943)

This hill is the first 500m Sub-Uchaf to have been deleted due to a Trimble GeoXH 6000 survey since details of the list were made public in November 2015. This status change was announced in a retrospective Hill Reclassifications post published on Mapping Mountains on the 13.07.20. The hill was previously listed as a 500m Sub-Uchaf based on a basic levelling survey conducted by Myrddyn Phillips on the 22.05.04, resulting in 46ft / 14.0m of drop. This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on the 05.05.16, resulting in a 520.8m summit height and a 508.3m bwlch height, with these values giving this hill 12.5m of drop, which is insufficient for its continued classification as a 500m Sub-Uchaf. 500m Sub-Uchaf total decreases by one and confirmed as 22.

Graig Fach 513.5m at SN 82117 93069

Graig Fach entered the ranks of Uchafion via a basic levelling survey and it has now been reclassified to the ranks of 500m Sub-Uchaf via a Trimble GeoXH 6000 survey

The first Uchaf to have been reclassified to a 500m Sub-Uchaf by surveying with the Trimble GeoXH 6000 since details of the list were made public in November 2015. This status change was announced via the Mapping Mountains site on 21.05.16, the hill had been previously listed as an Uchaf based on the 514m summit spot height appearing on Ordnance Survey 1:25,000 Explorer maps coupled with a basic levelling survey conducted by Myrddyn Phillips on 22.05.04 resulting in 56ft 6″ (17.2m) of drop. This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 05.05.16, with a second Trimble GeoXH 6000 survey conducted on the 22.02.19, resulting in the hill having 14.7m of drop, which is insufficient for qualification as an Uchaf. 500m Sub-Uchaf total increases by one and confirmed as 23.

4^th November 2015 – Mapping Mountains first publishes details to ‘The Welsh Highlands - Uchafion Cymru – Welsh Highland Subs’.

500m Sub-Uchaf total confirmed as 22.

Myrddyn Phillips and Aled Williams (January 2017)

Wednesday, 11 January 2017

Change Register - Welsh Highlands - Uchafion Cymru - Welsh Highland Subs

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