Change Register - Y Trechol - The Dominant Hills of Wales - Lesser Dominant Hills

Change Register

Y Trechol – The Dominant Hills of Wales

The Lesser Dominant Hills of Wales

Y Trechol  – The Dominant Hills of Wales are the Welsh P30 hills whose prominence equal or exceed half that of their absolute height, with the minimum qualifying mark given as a percentage (50%).  The list was conceptualized after adding drop values to the hand written Master Lists that took in the P30 hills of Wales that were published on Geoff Crowder’s v-g.me website, this was during 2006 and 2007 and the compilation of what was to become Y Trechol – The Dominant Hills of Wales followed soon afterward.

The original title for the list was the UPP’s, an abbreviation for the Ultra Prominent Peaks of Wales; this title was later changed to The Dominant Hills of Wales.  The change of name was instigated after a discussion with Mark Trengove who informed me that the same concept of Dominance had been used by Eberhard Jurgalski in written format in 2001 and in published format in 2004.  I also realised that the original title could be confused with the listing of 5,000ft prominence world peaks that are known as the Ultras, their title having been shortened from the Ultra Prominent Peaks, as it was sensible not to use a working title that was similar to another that used different criteria I opted for the title of Y Trechol - The Dominant Hills of Wales, with the term of Dominance used to describe it, and the words Y Trechol being the Welsh for The Dominants.  Accompanying the main list is a sub list entitled The Lesser Dominant Hills of Wales, these are the additional P30 Welsh hills whose prominence is 33% or more and below 50% of their absolute height, it is these hills that this Change Register concentrates on.

Although Y Trechol – The Dominant Hills of Wales was originally compiled in 2006 – 2007 after drop values were added to the Welsh P30 lists, the listing did not commence publication until 3^rd December 2015, with ‘commence’ being the operative word as this is ongoing with bi-weekly, monthly, bi-monthly or quarterly instalments of hill groups being published on Mapping Mountains.

Although the criteria has remained the same in the Dominant and Lesser Dominant list, the listing has benefited greatly since its first compilation with the advent of independent surveyors using GPS / GNSS receivers,  the analysis of LIDAR data and the availability of an expanded range of online Ordnance Survey maps all adding greater accuracy to the numerical data.  However, it is not just numerical data that has seen this list develop since its first inception, as local enquiry and historical research are enhancing the place-name data used for the listed hill names.

It seems fitting that the list of Y Trechol – The Dominant Hills of Wales – The Lesser Dominant Hills of Wales should now benefit from a detailed Change Register, and although the changes to this list have been catalogued on the Mapping Mountains site it will be useful to list all status changes to the list since first compilation and present them in a Change Register.

The Change Register to Y Trechol – The Dominant Hills of Wales – The Lesser Dominant Hills of Wales appears below with the reclassifications to the Lesser Dominant list being detailed chronologically in receding order. 

Change Register

Y Trechol – The Dominant Hills of Wales

The Lesser Dominant Hills of Wales 

 

Mynydd Pencarreg    414.9m at SN 57560 43215 

LIDAR bwlch image of Mynydd Pencarreg

The deletion of this hill from Lesser Dominant status was announced via the details in this Change Register.  It was previously listed as a Lesser Dominant due to a Trimble GeoXH 6000 summit survey and LIDAR bwlch analysis which gave the hill 138.7m of drop and 33.43% dominance.  Its deletion is due to analysis of the latest available LIDAR, resulting in a revised bwlch height of 276.7m and when coupled with the 414.9m summit height, these values give this hill 138.2m of drop and 33.32% dominance.  Lesser Dominant total decreases by one and confirmed as 277.

Pen y Crug    331.2m at SO 02927 30312 

Pen y Crug (SO 029 303)

The addition of this hill to Lesser Dominant status was announced with a retrospective Hill Reclassifications post published on Mapping Mountains on the 22.03.24.  The hill was previously listed with an estimated c 109m of drop, based on the 331.2m summit height ascertained from a Trimble GeoXH 6000 survey and an estimated c 222m bwlch height, based on interpolation of 5m contouring between 220m – 225m that appeared on the OS Maps website, with these values resulting in a 32.97% dominance value.  Its addition is due to LIDAR bwlch analysis conducted by Myrddyn Phillips, resulting in a 331.2m summit height and a 219.9m bwlch height, with these values giving this hill 111.4m of drop and 33.62% dominance.  Lesser Dominant total increases by one and confirmed as 278.

Hill Park    99.5m at SM 95585 10244 

LIDAR image of Hill Park (SM 955 102)

The addition of this hill to Lesser Dominant status was announced with a retrospective Hill Reclassifications post published on Mapping Mountains on the 19.01.24.  The hill was previously listed with an estimated c 31m of drop, based on the 99m summit spot height and an estimated c 68m bwlch height, based on interpolation of 5m contouring between 65m – 70m, resulting with the drop value being insufficient in relation to the summit height for consideration to Lesser Dominant status.  Its addition is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 99.5m summit height and a 63.6m bwlch height, with these values giving this hill 35.9m of drop and 36.16% dominance, with the caveat that the bwlch position has been relocated to a rail cutting which conforms with the protocols used in this list.  Lesser Dominant total increases by one and confirmed as 277.

 

Mynydd Cas-fuwch    346.4m at SN 02872 29646 

LIDAR image of Mynydd Cas-fuwch (SN 028 296)

The deletion of this hill from Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 01.03.23.  The hill was previously listed with 116m of drop and 33.43% dominance, based on the 347m summit spot height adjoined to a triangulation pillar that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 231m bwlch spot height that appears on the Ordnance Survey 1:50,000 Landranger map.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 346.4m summit height and a 231.5m bwlch height, with these values giving this hill 114.9m of drop and 33.17% dominance.  Lesser Dominant total decreases by one and confirmed as 276.

Rhos Trebared    70.3m at SN 17391 47521 

LIDAR image of Rhos Trebared (SN 173 475)

The deletion of this hill from Lesser Dominant status was instigated on the 22.05.22 with a retrospective Hill Reclassifications post published on Mapping Mountains on the 17.02.23.  The hill was previously listed with 30m of drop and 43.48% dominance, based on the 69m summit spot height and the 39m bwlch spot height that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 70.3m summit height and a 40.3m bwlch height, with these values giving this hill 29.9m of drop, which is insufficient for this hill to be classified as a Lesser Dominant.  Lesser Dominant total decreases by one and confirmed as 277.

Cnwc y Fedwen    111.3m at SN 38266 20540

LIDAR image of Cnwc y Fedwen (SN 382 205)

The deletion of this hill from Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 20.08.22.  The hill was previously listed with an estimated c 38m of drop and 34.23% dominance, based on the 111m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated c 73m bwlch height, based on interpolation of 5m contouring between 70m–75m that appear on the Ordnance Survey 1:25,000 Explorer map.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 111.3m summit height and a 74.4m bwlch height, with these values giving this hill 36.9m of drop and 33.16% of dominance.  Lesser Dominant total decreases by one and confirmed as 278.

Pen y Ddinas    230.9m at SN 62756 35746 

LIDAR image of Pen y Ddinas (SN 627 357)

The addition of this hill to Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 20.06.22.  The hill was previously listed with an estimated c 48m of drop, based on an estimated c 203m summit height and the 155m bwlch spot height that appeared on the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, with these values giving this hill insufficient dominance for Lesser Dominant status.  Its addition to Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 230.9m summit height and a 153.2m bwlch height, with these values giving this hill 77.7m of drop and 33.63% dominance.  Lesser Dominant total increases by one and confirmed as 279.

Pen Lan Fawr    98.3m at SN 62626 22229

LIDAR image of Pen Lan Fawr (SN 626 222)

The addition of this hill to Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 30.04.22.  The hill was previously listed with 30m of drop, based on the 95m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 65m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map, with this drop value not giving the hill sufficient dominance to be included as a Lesser Dominant hill.  Its addition to Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 98.3m summit height and a 64.9m bwlch height, with these values giving this hill 33.4m of drop and 33.97% dominance.  Lesser Dominant total increases by one and confirmed as 278.

The Rookery    102.6m at SN 61191 22707 

LIDAR image of The Rookery (SN 611 227)

The reclassification of this hill from Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 20.04.22.  The hill was previously listed with an estimated c 49m of drop and 48.04% dominance, based on the 102m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 53m bwlch height based on interpolation of 10m contouring between 50m – 60m.  Its reclassification to Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 102.6m summit height and a 50.3m bwlch height, with these values giving this hill 52.2m drop and 50.94% dominance.  Lesser Dominant total decreases by one and confirmed as 277.

Moel y Gadair    66.7m at SH 52165 39135 

LIDAR image of Moel y Gadair with the white contour placed 30m below the summit indicating this hill is a natural P30 with only the artificially raised road stopping the two respective white contours from being continuous

The reinstatement of this hill to Lesser Dominant status was announced in a Hill Reclassification post published on Mapping Mountains on the 09.03.22.  The hill was previously included in the Lesser Dominant sub list with an estimated c 31m of drop and 46.27% dominance, based on the 67m summit spot height and an estimated c 36m bwlch height.  Its subsequent deletion was due to a Trimble GeoXH 6000 survey and LIDAR analysis.  However, as the bwlch height ascertained from LIDAR analysis is placed on an artificially raised road, and as this is considered a relatively recent man-made construct and therefore not included as the height of the bwlch, LIDAR was re-examined by Aled Williams, who concluded that this hill is a natural P30 and therefore it is listed with a 66.7m summit height and a 35.8m bwlch height, with these values giving this hill 30.9m of drop and 46.30% dominance.  Lesser Dominant total increases by one and confirmed as 278.

The Park    85.6m at SN 66441 93678

LIDAR image of The Park (SN 664 936)

The reclassification of this hill to Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 28.07.21.  The hill was previously listed with an estimated c 41m of drop and 49.40% dominance, based on an estimated c 83m summit height and the 42m bwlch spot height that appears on the Ordnance Survey 1:25,000 Explorer map.  Its reclassification to Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in an 85.6m summit height and a 42.7m bwlch height, with these values giving this hill 42.9m drop and 50.09% dominance.  Lesser Dominant total decreases by one and confirmed as 277.

Llwynderw Hill    237.9m at SJ 19600 03662 

LIDAR image of Llwynderw Hill (SJ 196 036)

The deletion of this hill from Lesser Dominant status was announced in a Hill Reclassification post published on Mapping Mountains on the 21.06.21.  The hill was previously included in the Lesser Dominant sub list with an estimated c 80m of drop and 33.61% dominance based on the 238m summit spot height and an estimated c 158m bwlch height, the latter based on interpolation of 5m contouring between 155m – 160m that appears on the Ordnance Survey 1:25,000 Explorer map.  Its deletion is due to LIDAR analysis which confirmed the natural summit position of this hill and a subsequent Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips, resulting in a 237.9m summit height and a 159.7m bwlch height, with these values giving this hill 78.3m of drop and 32.89% dominance.  Lesser Dominant total decreases by one and confirmed as 278.

Banc    194.2m at SN 56817 75750 

Banc (SN 568 757)

The deletion of this hill from Lesser Dominant status was announced in a Hill Reclassification post published on Mapping Mountains on the 02.05.21.  The hill was previously included in the Lesser Dominant sub list with an estimated c 64m of drop and 33.33% dominance based on the 192m summit spot height adjoined to a triangulation pillar positioned at SN 56695 75938 and an estimated c 126m bwlch height, based on interpolation of 10m contouring between 120m – 130m that appears on the Ordnance Survey 1:25,000 Explorer map.  Its deletion is due to LIDAR analysis which relocated the position of its summit and a subsequent Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips, resulting in a 194.2m summit height and a 130.2m bwlch height, with these values giving this hill 64.0m of drop and 32.93% dominance.  Lesser Dominant total decreases by one and confirmed as 279.

Pen y Foel    122.5m at SH 42575 84415 

The Trimble GeoXH 6000 gathering data at the summit of Pen y Foel (SH 425 844)

This hill’s reclassification to Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 04.03.21.  The hill was previously listed with 49.40% dominance based on the 122.5m summit height derived from a Trimble GeoXH 6000 survey and a 62m bwlch height based on the spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  Its reclassification to Dominant status is due to partial LIDAR coverage of its bwlch, resulting in a more accurate interpolation of its bwlch height to an estimated c 61m, with these values giving this hill an estimated c 62m of drop and 50.21% dominance.  Lesser Dominant total decreases by one and confirmed as 280.

Wilcrick Hill    69.8m at ST 41128 87829

LIDAR image of Wilcrick Hill (ST 411 878)

This hill’s reclassification to Dominant status was announced when the Gwent Is Coed group of hills was published on Mapping Mountains on the 03.07.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 10.09.20.  The hill was originally listed with 49.28% dominance based on the 69m summit and 35m bwlch spot heights that appear on the Ordnance Survey 1:25,000 Explorer map.  However, as the 35m spot height appears between 30m – 35m contouring the drop value for this hill was re-assessed, resulting in an estimated c 33m bwlch height being used, giving c 36m of drop and 52.17% dominance.  The confirmation of its reclassification to a Dominant hill is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 69.8m summit height and a 33.3m bwlch height, with these values giving this hill 36.4m of drop and 52.21% dominance.  Lesser Dominant total decreases by one and confirmed as 281.

Cae Rosser    72.7m at SO 38857 00521

LIDAR image of Cae Rosser (SO 388 005)

This hill’s reclassification to Dominant status was announced when the Gwent Is Coed group of hills was published on Mapping Mountains on the 03.07.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 21.07.20.  The hill was originally listed with 49.32% dominance based on a 73m summit height and an estimated c 37m bwlch height, with these values giving this hill c 36m of drop.  Its reclassification to a Dominant hill is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 72.7m summit height and a 32.2m bwlch height, with these values giving this hill 40.5m of drop and 55.68% dominance.  Lesser Dominant total decreases by one and confirmed as 282. 

Cae Scybor    125.5m at ST 40051 98581

LIDAR image of Cae Scybor (ST 400 985)

The deletion of this hill from Lesser Dominant status was announced in a Hill Reclassification post published on Mapping Mountains on the 19.06.20.  The hill was previously included in the Lesser Dominant sub list with c 42m of drop and 33.60% dominance based on the 125m summit spot height and an estimated bwlch height of c 83m.  Its deletion is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 125.5m summit height and an 83.7m bwlch height, with these values giving this hill 41.8m of drop and 33.29% dominance.  Lesser Dominant total decreases by one and confirmed as 283.

Long Park    79.2m at SS 07255 98449

LIDAR image of Long Park (SS 072 984)

This hill was added to the Lesser Dominant sub list on the 14.01.20 with a retrospective Hill Reclassification post published on Mapping Mountains on the 26.05.20.  The hill was originally listed with an estimated c 29m of drop and therefore was not considered for Lesser Dominant status.  Its inclusion is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 79.2m summit height and a 48.0m bwlch height, with the latter taken to a railway cutting which meets the criteria used in this list, with these values giving this hill 31.1m of drop and 39.34% dominance.  Lesser Dominant total increases by one and confirmed as 284.

Cymin    256.4m at SO 52771 12511

LIDAR image of Cymin (SO 527 125)

The addition and reinstatement of this hill to Lesser Dominant status was announced in a retrospective Hill Reclassifications post published on Mapping Mountains on the 25.04.20.  The hill was originally listed with 33.46% dominance based on an estimated c 257m summit height and an estimated c 171m bwlch height, with these values giving this hill c 86m of drop.  It was then deleted due to the 256m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map, resulting in an estimated drop of c 85m and 33.20% dominance.  Its reinstatement is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 256.4m summit height and a 170.6m bwlch height, with these values giving this hill 85.8m of drop and 33.47% dominance.  Lesser Dominant total increases by one and confirmed as 283.

Cymin    256m at SO 52762 12507

The deletion of this hill from Lesser Dominant status was announced in a retrospective Hill Reclassifications post published on Mapping Mountains on the 17.04.20.  The hill was originally listed with 33.46% dominance based on an estimated c 257m summit height and an estimated c 171m bwlch height, with these values giving this hill c 86m of drop.  Its deletion is due to the 256m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map, resulting in an estimated drop of c 85m and 33.20% dominance.  Lesser Dominant total decreases by one and confirmed as 282.

Trostrey Hill    199.3m at SO 36920 05188

LIDAR image of Trostrey Hill (SO 369 051)

The reclassification of this hill to Lesser Dominant status was announced when the Mynyddoedd Duon group was published on Mapping Mountains on the 03.07.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 12.03.20.  The hill was originally listed with 68.84% dominance based on a 199m summit height and a 62m bwlch height, with these values giving this hill 137m of drop.  Its reclassification to Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in this hill being lower than the adjacent hill of Coed y Bwnydd (SO 36613 06919) and therefore their bylchau swapped.  LIDAR analysis gives this hill a 199.3m summit height and a 129.1m bwlch height, with the former taken to remaining natural ground with LIDAR also giving a 199.5m height positioned at SO 36920 05184 to a raised field boundary that is excluded from the height of this hill as it is considered a relatively recent man-made construct, with these values giving this hill 70.2m of drop and 35.23% dominance.  Lesser Dominant total increases by one and confirmed as 283.

Coed y Bwnydd    201.4m at SO 36613 06919

LIDAR image of Coed y Bwnydd (SO 366 069)

The reclassification of this hill to Dominant status was announced when the Mynyddoedd Duon group was published on Mapping Mountains on the 03.07.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 01.02.20.  The hill was originally listed with 34.69% dominance based on a 196m summit height and an estimated c 128m bwlch height, with these values giving this hill c 68m of drop.  Its reclassification to Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in this hill being higher than the adjacent Trostrey Hill (SO 36920 05188) and therefore their bylchau swapped.  LIDAR analysis gives this hill a 201.4m summit height and a 59.4m bwlch height, with the former taken to an earthen embankment that forms a part of an ancient hill fort and the latter taken to a road cutting, both of which conform with the criteria used within this list, with these values giving this hill 142.0m of drop and 70.50% dominance.  Lesser Dominant total decreases by one and confirmed as 282.

Ash Wood    206.4m at SO 48011 12229

LIDAR image of Ash Wood (SO 480 122)

This hill’s reclassification to Dominant status was announced when the Mynyddoedd Duon group was published on Mapping Mountains on the 03.07.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 22.01.20.  The hill was originally listed with 49.03% dominance based on an estimated c 206m summit height and an estimated c 105m bwlch height, with these values giving this hill c 101m of drop.  Its reclassification to a Dominant hill is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 206.4m summit height and a 97.6m bwlch height, with the latter taken to a track cutting which conforms with the criteria used within this list, with these values giving this hill 108.8m of drop and 52.69% dominance.  Lesser Dominant total decreases by one and confirmed as 283.

Pandy Bank    105.4m at SJ 33630 53882

Pandy Bank (SJ 336 538)

The addition of this hill to Lesser Dominant status was announced in a Hill Reclassifications post on Mapping Mountains on the 11.12.19, with it previously listed with 32.61% dominance based on a 105.4m Trimble GeoXH 6000 summit survey and an estimated bwlch height of c 71m.  Its addition to Lesser Dominant status is due to LIDAR bwlch analysis initially conducted by Chris Crocker and subsequently by Myrddyn Phillips resulting in a 70.2m bwlch height giving this hill 35.1m of drop and 33.34% dominance, which is sufficient for Lesser Dominant status.  Lesser Dominant total increases by one and confirmed as 284.

Deg Erw Llandafin    66.4m at ST 00313 73177 & ST 00315 73179

LIDAR image of Deg Erw Llandafin (ST 00313 73177 and ST 00315 73179)

The deletion of this hill from Lesser Dominant status was announced in a Hill Reclassifications post on Mapping Mountains on the 21.10.19, with it previously listed with 44.78% dominance and c 30m of drop based on the 67m summit height that appears as a spot height on the Ordnance Survey 1:25,000 Explorer map and an interpolated bwlch height of c 37m.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 66.4m summit height and 37.2m bwlch height, with these values giving this hill 29.2m of drop which is insufficient for it to be considered for Lesser Dominant status.  Lesser Dominant total decreases by one and confirmed as 283.

Old Castle Down    102.0m at SS 89898 75814

LIDAR image of Old Castle Down (SS 898 758)

This hill was originally included as a Lesser Dominant based on the 102m summit and 68m bwlch spot heights, with these values giving this hill 34m of drop and 33.33% dominance.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 102.0m summit height and 68.9m bwlch height, with these values giving this hill 33.1m of drop and 32.44% dominance.  With a Hill Reclassifications post appearing on Mapping Mountains on the 24.09.19.  Lesser Dominant total decreases by one and confirmed as 284.

Pt. 65.9m    65.9m at ST 35225 94717

LIDAR image of Pt. 65.9m (ST 352 947)

The reclassification of this hill to Lesser Dominant status was announced when the Cymoedd Gwent group of hills was published on Mapping Mountains on the 03.05.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 14.09.19.  The hill was originally listed with 50.00% dominance based on the 66m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 33m 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.  The reclassification of this hill is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 65.9m summit height and a 34.3m bwlch height, with these values giving this hill 31.6m of drop and 47.93% dominance.  Lesser Dominant total increases by one and confirmed as 285.

Coed Cae Maen    101.0m at ST 36203 99841

LIDAR image of Coed Cae Maen (ST 362 998)

This hill was originally included as a Lesser Dominant based on an estimated summit and bwlch height of c 101m and c 67m respectively, with these values giving this hill c 34m of drop and 33.66% dominance.  Its deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 101.0m summit height and 67.6m bwlch height, with these values giving this hill 33.5m of drop and 33.12% dominance.  With a Hill Reclassifications post appearing on Mapping Mountains on the 27.08.19.  Lesser Dominant total decreases by one and confirmed as 284.

Pt. 63.3m    63.3m at SH 49157 76080

LIDAR bwlch image of Pt. 63.3m (SH 491 760)

The announcement of this hill’s deletion from Lesser Dominant status was made via a Hill Reclassifications post that was published on Mapping Mountains on the 04.05.19.  The hill was originally listed with 46.875% dominance and c 30m of drop based on the 64m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 34m based on interpolation of 5m contouring between 30m - 35m on the Ordnance Survey 1:25,000 Explorer map.  The deletion of this hill is due to LIDAR bwlch analysis and a Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips resulting in a 63.3m summit height and a 35.1m bwlch height, with these values giving this hill 28.2m of drop, which is insufficient for consideration either to the Dominant or Lesser Dominant list.  Lesser Dominant total decreases by one and confirmed as 285.

Pt. 77.7m    77.7m at ST 12931 77574

LIDAR bwlch image for Pt. 77.7m (ST 129 775)

This hill was included as a Lesser Dominant when the Cymoedd Morgannwg group of Dominant hills was published on Mapping Mountains on the 03.04.19 and a subsequent Hill Reclassifications post appeared on the 06.08.19.  The hill was not originally listed as a Lesser Dominant as its drop was documented as c 26m.  The addition of this hill is due to LIDAR analysis conducted by Myrddyn Phillips and is dependent upon the prioritised acceptance of bwlch heights to railway cuttings resulting in a 77.7m summit height and a 44.4m bwlch height, with these values giving this hill 33.3m of drop and 42.82% dominance.  Lesser Dominant total increases by one and confirmed as 286.

Mynydd y Glyn    377m at ST 03193 89647

This hill’s status as a Dominant hill was announced when the Cymoedd Morgannwg group was published on Mapping Mountains on the 03.04.19, with a subsequent Hill Reclassifications post being published on Mapping Mountains on the 14.05.19.  The hill was originally listed with 48.28% dominance based on the 377m summit spot height and an estimated bwlch height of c 195m, with these values giving this hill c 182m of drop.  The reclassification of this hill is due to LIDAR bwlch analysis conducted by Myrddyn Phillips resulting in a bwlch height of 187.7m, which when coupled with its 377m summit height gives this hill 189m of drop and 50.20% dominance.  Lesser Dominant total decreases by one and confirmed as 285.

Coed Darcy    80.4m at SS 71147 95565

LIDAR summit image of Coed Darcy

The announcement of this hill’s deletion from Lesser Dominant status was made via a Hill Reclassifications post that was published on Mapping Mountains on the 25.03.19.  The hill was originally listed with 37.35% dominance and 31m of drop based on the 83m summit spot height that appears on the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map and the 52m bwlch spot height that appears on the Ordnance Survey 1:25,000 Explorer map.  The deletion of this hill is due to LIDAR analysis conducted by Myrddyn Phillips resulting in an 80.4m summit height and a 53.0m bwlch height, with these values giving this hill 27.4m of drop, which is insufficient for consideration either to the Dominant or Lesser Dominant list.  Lesser Dominant total decreases by one and confirmed as 286.

Pantau    115.8m at SN 64809 22669 and SN 64816 22665

LIDAR image of Pantau

The deletion of this hill from Lesser Dominant status was announced when the Hill Reclassifications post was published on Mapping Mountains on the 23.02.19.  The hill was originally listed with 34.19% dominance based on the 117m summit and 77m bwlch spot heights that appear on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website.  This deletion is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 115.8m summit height and a 77.3m bwlch height, giving this hill 38.6m of drop and 33.31% dominance.  Lesser Dominant total decreases by one and confirmed as 287.

Cae Ddu Main    106.9m at SN 62212 98337

LIDAR image of Cae Ddu Main

The addition of this hill to Lesser Dominant status was announced when the Mynydd Penlle’rcastell group of hills were published on Mapping Mountains on the 03.12.19, with a Hill Reclassifications post being published on the 18.02.19.  This addition is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 106.9m summit height and a 69.1m bwlch height, giving this hill 37.8m of drop and 35.34% dominance.  Lesser Dominant total increases by one and confirmed as 288.

Cae Ffwyn Uchaf    66.6m at SN 58825 00532

LIDAR image of Cae Ffwyn Uchaf

This hill’s reclassification from Dominant to Lesser Dominant status was announced when the Mynydd Penlle’rcastell group of hills were published on Mapping Mountains on the 03.12.19, with a Hill Reclassifications post being published on the 04.02.19.  The hill was initially classified as a Dominant based on a 67m summit spot height and an estimated bwlch height of c 33m, with these values giving this hill c 34m of drop and 50.75% dominance.  This hill’s reclassification to Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips resulting in a 66.6m summit height and a 36.0m bwlch height, giving this hill 30.6m of drop and 45.90% dominance.  Lesser Dominant total increases by one and confirmed as 287.

Five Acres    125.1m at SS 53779 93281 and SS 53779 93291 and SS 53774 93296 and SS 53780 93297

LIDAR image of Five Acres (SS 53779 93281) and (SS 53779 93291) and (SS 53774 93296) and (SS 53780 93297)

The deletion of this hill from Lesser Dominant status was instigated when the Gŵyr group of hills were updated for publication on Mapping Mountains on the 03.11.18, with a Hill Reclassifications post being published on the 17.11.18.  The hill was initially classified as a Lesser Dominant with 33.86% dominance based on an estimated c 127m summit height and an estimated c 84m bwlch height based on interpolation of 5m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.  This hill’s deletion from Lesser Dominant status is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 125.1m summit and 84.3m bwlch height, giving this hill 40.8m of drop and 32.59% dominance.  Lesser Dominant total decreases by one and confirmed as 286.

Cae    119.0m at SN 56069 03819

LIDAR image of Cae (SN 560 038)

This hill was not included in the Lesser Dominant list when the Mynydd Sylen group of hills were published on Mapping Mountains on the 03.10.18, with a Hill Reclassifications post being published on the 07.11.18.  The hill was initially classified as a Lesser Dominant with 33.61% dominance based on the 119m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 79m bwlch height, based on interpolation of 5m contouring between 75m – 80m.  This deletion of the hill is due to LIDAR analysis conducted by Myrddyn Phillips, resulting in a 119.0m summit height and an 80.0m bwlch height, with these values giving this hill 39.0m of drop and 32.79% dominance.  Lesser Dominant total decreases by one and confirmed as 287.

Mynydd Pencarreg    414.9m at SN 57560 43215

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM LESSER DOMINANT STATUS

Mynydd Pencarreg (SN 575 432) is now classified as a Lesser Dominant

The addition of this hill to Lesser Dominant status followed a Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips on the 31.07.18 coupled with LIDAR analysis which had previously been conducted by Aled Williams, with a Hill Reclassifications post being published on Mapping Mountains on the 18.12.18.  The hill was initially documented with 33.25% dominance based on its 147m summit spot height and an interpolated bwlch height of c 277m.  This hill’s addition to Lesser Dominant status is due to a 414.9m summit survey and a 276.2m LIDAR bwlch height, with these values giving this hill 138.7m of drop and 33.43% dominance.  Lesser Dominant total increases by one and confirmed as 288.

Pen Twmp    217m at SM 98820 32984

This hill’s reclassification from Lesser Dominant to Dominant status was announced when the Mynydd Preseli group of hills were published on Mapping Mountains on the 03.07.18, with a Hill Reclassifications post being published on the 14.08.18.  The hill was initially classified as a Dominant based on interpolation of bwlch contours and later reclassified to a Lesser Dominant (see below) based on the 109m spot height that appears on the area of this hill’s bwlch on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website.  This hill’s reclassification back to Dominant status is due to LIDAR bwlch analysis conducted by Myrddyn Phillips resulting in a bwlch height of 108.3m, giving this hill 109m of drop and 50.09% Dominance.  Lesser Dominant total decreases by one and confirmed as 287.

Rhos Ymryson    324m at SN 46038 50017

This Lesser Dominant status of this hill was announced on Mapping Mountains on the 03.06.18 when the Rhos Ymryson group of hills was published, with a Hill Reclassification post appearing on Mapping Mountains on the 04.06.18.  The hill was previously listed as a Dominant hill with 50.15% dominance based on the 327m summit and 163m bwlch spot heights that appear on the Ordnance Survey 1:25,000 Explorer map.  However, as this summit height is given to the top of a covered reservoir, and as these constructions are not accepted as being a part of a hill’s height in this list, the summit height was re-evaluated.  As the position of the highest natural ground at the base of the covered reservoir is given as SN 46038 50017 and as this is extremely close to where a 1062ft (323.7m) levelled height appears on the Ordnance Survey series of Six-Inch maps which matches the rounded up 324m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map, it is this height that is being used for that of this hill’s summit, and when coupled with the 162.5m bwlch height derived from LIDAR analysis, these values give this hill 161m of drop and 49.83% dominance which is insufficient for its continued status as a Dominant hill.  Lesser Dominant total increases by one and confirmed as 288.

Pt. 70.3m    70.3m at SH 30993 29739

This hill was originally promoted to Lesser Dominant status based on map detail (see below) it has subsequently been deleted from Lesser Dominant status due to LIDAR analysis initially conducted by Chris Crocker with subsequent analysis by Myrddyn Phillips, resulting in a 70.3m summit height and a 40.7m bwlch height, giving 29.6m of drop which is insufficient for consideration to the Dominant list, with the relevant Hill Reclassification post appearing on Mapping Mountains on the 11.04.18.  Lesser Dominant total decreases by one and confirmed as 287. 

Coed y Garth    83.4m at SH 66061 16545

This hill’s life as a P30 and Lesser Dominant hill has been short lived as it was only given this status in June 2016 with its inclusion as a Lesser Dominant hill being announced on Mapping Mountains on the 03.11.16 when the Cadair Idris group of hills were published (see below), with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 27.05.17.  This hill’s deletion from Lesser Dominant status is due to LIDAR analysis initially conducted by Chris Crocker and George Gradwell, and subsequently by Myrddyn Phillips resulting in an 83.4m summit height and a 56.2m bwlch height, giving 27.1m of drop which is insufficient for consideration to the Dominant list, with the relevant Hill Reclassification post appearing on Mapping Mountains on the 10.04.18.  Lesser Dominant total decreases by one and confirmed as 288. 

Copa Shon    217.3m at SN 78108 99347

Copa Shon (SN 781 993) is now split from its twin map heighted summit of Pen y Graig Fawr (SN 773 996) and has been surveyed as the higher resulting in its addition to Lesser Dominant status

This hill’s addition to Lesser Dominant status was confirmed by a survey with the Trimble GeoXH 6000 which took place on the 29.10.17, with the relevant post announcing the survey details being published on Mapping Mountains on the 31.12.17, with a Hill Reclassifications post appearing on Mapping Mountains on the 06.01.18.  Prior to the survey with the Trimble GeoXH 6000 this hill’s twin 217m map heighted summit of Pen y Graig Fawr which is positioned at SN 77352 99601 was prioritised as being listed as a Lesser Dominant, the subsequent survey separated these twin map heighted tops with Copa Shon proving the higher, resulting in this hill having a 217.3m (converted to OSGM15) summit height, which is 0.50m higher than its twin map heighted summit of Pen y Graig Fawr, therefore with 89.5m of drop and 41.167% Dominance this hill is added to the Lesser Dominant list.  Lesser Dominant total increases by one and confirmed as 289.

Pen y Graig Fawr    216.8m at SN 77352 99601

Pen y Graig Fawr (SN 773 996) is now split from its twin map heighted summit of Copa Shon (SN 781 993) and has been surveyed as the lower resulting in its deletion from Lesser Dominant status

The deletion of this hill from Lesser Dominant status was confirmed by a survey with the Trimble GeoXH 6000 which took place on the 29.10.17, with the relevant post announcing the survey details being published on Mapping Mountains on the 31.12.17, with a Hill Reclassifications post appearing on Mapping Mountains on the 05.01.18.  Prior to the survey with the Trimble GeoXH 6000 this hill was prioritised as a Lesser Dominant over its twin 217m map heighted summit of Copa Shon which is positioned at SN 78108 99347, the subsequent survey separated these twin map heighted tops with Copa Shon proving the higher, resulting in Pen y Graig Fawr having a 216.8m (converted to OSGM15) summit height and 182.4m (converted to OSGM15) bwlch height, giving this hill 34.4m of drop and 15.88% Dominance, which is insufficient for its continued inclusion as a Lesser Dominant.  Lesser Dominant total decreases by one and confirmed as 288.

Carn Ysgubor    102.4m at SM 69953 24603 

Carn Ysgubor (SM 699 246) now reclassified back to a Lesser Dominant

This hill was originally listed as a Lesser Dominant and subsequently reclassified to a Dominant hill based on the result of a survey conducted with the Trimble GeoXH 6000 (see below), the adoption of OSGM15 has resulted in accurately known heights in Wales increasing by approximately 2-4cm and this has resulted in Carn Ysgubor being reclassified back to Lesser Dominant status.  The announcement of this hill’s reclassification back to a Lesser Dominant was made on the Mapping Mountains site on 05.07.17, the hill was previously listed with 50.00% Dominance based on the 102.4m summit and 51.2m bwlch heights produced by a survey with the Trimble GeoXH 6000 conducted by Myrddyn Phillips on the 15.05.16, these values when converted to OSGM15 are 102.395m summit and 51.208m bwlch heights, with these values giving 51.187m drop and 49.99% Dominance.  Lesser Dominant total increases by one and confirmed as 289.

Allt Dan Tŷ Mawr    72.65m at SN 52004 22867 

LIDAR image of Allt Dan Tŷ Mawr (SN 520 228)

The re-evaluation relating to the details of this hill were completed on the 24.01.17 and its inclusion as a Lesser Dominant hill was announced on Mapping Mountains on the 03.03.18 when the Mynydd Mallaen group of hills were published, with a Hill Reclassifications post appearing on Mapping Mountains on the 05.03.18.  The hill was previously considered not to have the minimum 30m of drop required for consideration to this list as Ordnance Survey maps of the day did not have a spot height for the summit, and with an estimated summit height of c 67m and a bwlch spot height of 38m it gave this hill an estimated c 29m of drop.  Its reclassification is due to a 69m summit spot height appearing on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website and subsequent LIDAR analysis conducted by Myrddyn Phillips resulting in a 72.65m summit height and a 39.0m bwlch height, with these values giving this hill 33.7m of drop and 46.32% dominance, which is sufficient for Lesser Dominant status.  Lesser Dominant total increases by one and confirmed as 288.

Castell    73m at SN 58519 79005

The re-evaluation relating to the details of this hill were completed on the 24.01.17 and its inclusion as a Lesser Dominant hill was announced on Mapping Mountains on the 03.01.18 when the Elenydd group of hills were published, with a Hill Reclassifications post appearing on Mapping Mountains on 13.01.18, the hill was previously considered not to have the minimum 30m of drop required for consideration to this list as Ordnance Survey maps of the day did not have a spot height for the area of the bwlch, however with a 73m summit spot height on the Ordnance Survey 1:25,000 Explorer map and a 42m bwlch spot height appearing on the Ordnance Survey Interactive Coverage Map hosted on the Geograph website this hill is now listed with 31m of drop and 42.47% Dominance which is sufficient for it to be included as a Lesser Dominant hill.  Lesser Dominant total increases by one and confirmed as 287.

Pt. 119m    119m at SH 72136 00406 

The details relating to this hill were re-evaluated and completed on the 06.06.16 resulting in it being reclassified from a Lesser Dominant hill to a Dominant hill, with this being announced on Mapping Mountains on the 03.12.16 when the Tarennydd group of hills were published, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 28.05.17.  The hill was previously listed with 48.25% Dominance based on an estimated c 114m summit height and a 59m bwlch height which appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and its reclassification is due to the 119m summit spot height that appears on the Ordnance Survey enlarged mapping hosted on the Geograph website which is sufficient for this hill to qualify as a Dominant hill.  Lesser Dominant total decreases by one and confirmed as 286.

Coed y Garth    87m at SH 66100 16583 

The re-evaluation relating to the details of this hill were completed on the 02.06.16 and its inclusion as a Lesser Dominant hill was announced on Mapping Mountains on the 03.11.16 when the Cadair Idris group of hills were published, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 27.05.17, the hill was previously considered not to have the minimum 30m of drop required for consideration to this list as Ordnance Survey maps of the day did not have spot heights for either the summit or bwlch, however with an 87m summit spot height on the Harvey 1:25,000 Superwalker map and a 56m bwlch spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website this hill is now listed with 31m of drop and 35.63% Dominance which is sufficient for it to be included as a Lesser Dominant hill.  Lesser Dominant total increases by one and confirmed as 287.  Due to LIDAR analysis this hill has subsequently been deleted from Lesser Dominant status (see above). 

Foel Fawr    72.0m at SM 70542 22567 

Foel Fawr (SM 705 225) classified as a Lesser Dominant due to a survey with the Trimble GeoXH 6000

The addition of this hill to Lesser Dominant status was announced on Mapping Mountains on the 09.06.16, with the survey that resulted in this hill’s addition being conducted on the 15.05.16, and the Hill Reclassifications post being published on Mapping Mountains on the 12.06.16, the hill was not previously listed in Y Trechol – The Dominant Hills of Wales as it was listed with an estimated drop of c 29m based on the 72m summit spot height and an estimated bwlch height of c 43m based on interpolation of contouring between 40m – 45m, with this drop value insufficient for consideration to the Dominant and Lesser Dominant list.  The hill has subsequently been surveyed using a Trimble GeoXH 6000 by Myrddyn Phillips on the 15.05.16, resulting in a 72.0m (converted to OSGM15) summit height and a 41.9m (converted to OSGM15) bwlch height, with these values giving this hill 30.1m of drop and 41.78% Dominance.  Lesser Dominant total increases by one and confirmed as 286.

Carn Ysgubor    102.4m at SM 69953 24603 

Carn Ysgubor (SM 699 246) is situated on the northern part of Ynys Dewi

The announcement of this hill’s reclassification from a Lesser Dominant to a Dominant hill was made on the Mapping Mountains site on 09.06.16 with the Hill Reclassifications post being published on the 10.06.16, the hill was previously listed with 49.50% Dominance based on the 101m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 51m based on interpolation of  bwlch contouring between 50m – 55m, with these values giving this hill c 50m of drop.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 15.05.16, resulting in the summit height being 102.4m and the bwlch height being 51.2m, giving a drop value of 51.2m and a Dominance value of 50.00%.  The survey data for this hill has subsequently been converted to OSGM15 resulting in the hill being reclassified back to Lesser Dominant status (see above).  Lesser Dominant total decreases by one and confirmed as 285.

Moel y Gadair    66.7m at SH 52165 39135 

The Trimble GeoXH 6000 gathering data at the summit of Moel y Gadair (SH 521 391)

This hill has subsequently been reinstated to Lesser Dominant status (see above) due to LIDAR analysis indicating this hill is a natural P30, with the raised road passing over the bwlch considered a relatively recent man-made construct; therefore it is excluded from the height of the bwlch. 

The deletion of this hill from a Lesser Dominant was announced on Mapping Mountains on the 06.03.16 with the Hill Reclassifications post published on the 08.03.16, the hill was originally listed with 46.27% Dominance based on the 67m summit spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps and an estimated bwlch height of c 36m based on bwlch contouring between 30m – 40m, with these values giving the hill c 31m of drop.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 15.06.15, resulting in a 66.7m (converted to OSGM15) summit height and incorrect placement of the Trimble at the area of the bwlch due to interpolation of bwlch contours, therefore the bwlch of this hill was re-surveyed with the Trimble GeoXH 6000 on the 23.02.16 resulting in a 38.1m (converted to OSGM15) bwlch height which when combined with the 66.7m summit height gives this hill only 28.5m of drop, which is insufficient for its continued classification as a Lesser Dominant hill.  Lesser Dominant total decreases by one and confirmed as 286.

Moelfre    74.1m at SH 55830 37553 

Moelfre (SH 558 375) reclassified from a Dominant to a Lesser Dominant

The reclassification of this hill to a Lesser Dominant was announced on Mapping Mountains on the 03.03.16 with the Hill Reclassifications post published on the 04.03.16, the hill was previously listed with 50.00% Dominance based on the 74m summit spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website and an estimated bwlch height of c 37m based on bwlch contouring between 35m – 40m.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 23.02.16, resulting in 74.1m (converted to OSGM15) summit and 37.8m (converted to OSGM15) bwlch heights, with these values giving a drop of 36.3m and a Dominance of only 49.00%.  Lesser Dominant total increases by one and confirmed as 287.

Moel y Penmaen    153m at SH 33810 38687  

This hill’s classification as a Lesser Dominant was announced on the 11.02.16 when the Pen Llŷn group of hills was published on the Mapping Mountains site, with a retrospective Hill Reclassifications post appearing on the 22.03.17, the hill is listed in this sub category as it has a 153m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 92m which is based on the 10m contour intervals on the 1:50,000 Landranger and the 1:25,000 Explorer map as well as the 5m contour intervals on the Ordnance Survey enlarged mapping hosted on the Geograph website, with these values giving this hill c 61m of drop and 39.87% Dominance.  Lesser Dominant total increases by one and confirmed as 286.

Pt. c 71m    c 71m at SH 31034 29730  

The inclusion of this hill as a Lesser Dominant was announced on the 11.02.16 when the Pen Llŷn group of hills was published on the Mapping Mountains site, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 21.03.17, the hill was previously listed with c 25m of drop based on 10m contour intervals at the bwlch on Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps which is insufficient for consideration as either a Dominant or Lesser Dominant hill.  As the more detailed Ordnance Survey mapping hosted on the Geograph website has 5m contour intervals and a 41m bwlch spot height for this hill, it gives a drop of c 30m based on an estimated c 71m summit height and a Dominance of 42.25% which is sufficient for inclusion in the Lesser Dominant list.  Lesser Dominant total increases by one and confirmed as 285.  Due to LIDAR analysis this hill has subsequently been deleted from Lesser Dominant status (see above). 

Pt. 66m    66m at SH 29957 27041 

This hill’s reclassification from a Lesser Dominant hill was announced on the 11.02.16 when the Pen Llŷn group of hills was published on Mapping Mountains, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 19.03.17, the hill was previously listed with 48.44% Dominance based on a 64m map heighted summit at SH 295 266.  In recent times the Ordnance Survey larger scaled mapping has become available on the Geograph website and this more detailed map shows a 66m summit spot height at SH 299 270 and a connecting 32m bwlch spot height, with the subsequent drop of 34m sufficient for this hill to qualify as a Dominant hill with 51.52% Dominance.  Lesser Dominant total decreases by one and confirmed as 284. 

3^rd December 2015 – Mapping Mountains starts publication of Y Trechol – The Dominant Hills of Wales. 

Lesser Dominant total confirmed as 285.

Bryn Mawr    178.1m at SJ 25117 19054 

The wooded summit of Bryn Mawr (SJ 251 190)

The reclassification of this hill from a Lesser Dominant to a Dominant hill was due to a survey conducted by Myrddyn Phillips with the Trimble GeoXH 6000 on the 08.08.15, with its details appearing in the Carnedd Wen group of hills when published on Mapping Mountains on the 03.06.17, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 16.07.17, the hill was previously listed with 49.13% Dominance based on an estimated c 173m summit height and an estimated c 88m bwlch height, with the latter height later confirmed via an 88m spot height appearing on the Ordnance Survey enlarged mapping hosted on the Geograph website.  The subsequent survey with the Trimble produced a 178.1m (converted to OSGM15) summit height, giving this hill 90m of drop and 50.53% Dominance.  Lesser Dominant total decreases by one and confirmed as 285.

Mynydd Coch    468.3m at SH 80458 09952 

Mynydd Coch (SH 804 099) just fails to meet the criteria for Lesser Dominant status

The deletion of this hill from Lessser Dominant status was announced on Mapping Mountains on the 17.05.15, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 08.10.16, the hill was previously listed with 33.48% Dominance based on its 469m summit spot height and its 312m bwlch spot height, with these values giving this hill 157m of drop.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips and Graham Jackson on the 13.05.15, resulting in a 468.3m (converted to OSGM15) summit height, giving the hill 156m of drop and 33.31% Dominance which is insufficient for its retention in the Lesser Dominant list.  Lesser Dominant total decreases by one and confirmed as 286.

Carreglefain    260.7m at SH 32421 41054 

The impressive summit cliff of Carreglefain (SH 324 410)

The announcement of this hill’s reclassification from a Lesser Dominant to a Dominant hill was made on the Mapping Mountains site on 01.12.14 with the Hill Reclassifications post being published on the 20.03.17, the hill was previously listed with 48.66% Dominance based on the 261m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 134m based on bwlch contouring between 130m – 140m.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 24.11.14, resulting in the summit height being 260.7m (converted to OSGM15) and the bwlch height being 130.1m (converted to OSGM15), giving a drop value of 130.6m and a Dominance value of 50.08%.  Lesser Dominant total decreases by one and confirmed as 287.

Llanlleiana Park at SH 38337 94993 

Llanlleiana Park (SH 383 949) is now reclassified to a Lesser Dominant

This hill’s reclassification from a Dominant to a Lesser Dominant was announced on the Mapping Mountains site on 13.09.14 with the Hill Reclassifications post appearing on the 07.12.15, the hill was previously listed with a summit height of 67m based on the spot height that appears on the Ordnance Survey enlarged mapping hosted on the Geograph website and an estimated bwlch height of c 33m, with these values giving this hill c 34m of drop and 50.75% Dominance.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips and Alex Cameron on 07.09.14, resulting in the summit height being 68.2m (converted to OSGM15) and the bwlch height being 34.2m (converted to OSGM15), giving a drop value of 34.0m and a Dominance of only 49.85%, which is insufficient for it to retain its Dominant status.  Lesser Dominant total increases by one and confirmed as 288.

Pt. 258m    258m at SH 64705 06587 

The details relating to this hill were re-evaluated and completed on the 16.04.14 resulting in it being classified as a Lesser Dominant hill, with this being announced on Mapping Mountains on the 03.12.16 when the Tarennydd group of hills were published, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on the 29.05.17.  The hill was previously listed with c 81m of drop which when coupled with its 258m summit spot height only gave the hill 31.40% Dominance, and its inclusion as a Lesser Dominant hill is due to the 171m bwlch spot height that appears on the Ordnance Survey enlarged mapping hosted on the Geograph website which is sufficient for this hill to qualify with 33.72% Dominance.  Lesser Dominant total increases by one and confirmed as 287.

Pt. 259m    259m at SJ 18114 43816 

The details relating to this hill were re-evaluated and completed on the 29.03.14 resulting in it being added to the list of Lesser Dominant hills, with this being announced on Mapping Mountains when the Y Berwyn group of hills were published on the 03.03.17, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on 04.06.17.  The hill was previously listed with 33.20% Dominance based on the 259m summit spot height on the Ordnance Survey 1;25,000 Explorer map and an estimated bwlch height of c 173m, and its addition is due to a re-interpolation of the hill’s bwlch height resulting in 87m of drop and 33.59% Dominance, which is sufficient for it to be classified as a Lesser Dominant hill.  Lesser Dominant total increases by one and confirmed as 286.

Coed y Gaer    361.0m at SO 00491 84393

LIDAR image of Coed y Gaer (SO 004 843)

The addition of this hill to Lesser Dominant status was prompted by a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips on the 09.02.14, and confirmed by subsequent LIDAR analysis, with the post announcing the survey details published on Mapping Mountains on the 11.02.14, and a retrospective Hill Reclassifications post appearing on Mapping Mountains on the 23.08.17.  The hill was previously listed with an estimated c 119m of drop based on the 362m summit spot height that appears on the Ordnance Survey 1:50,000 Lanranger and 1:25,000 Explorer map and an estimated c 243m bwlch height.  With the drop and dominance value subsequently amended when a 241m bwlch spot height appeared on the Ordnance Survey Vector Map Local hosted hosted on the Geograph website and which was entitled the Interactive Coverage Map.  The addition of this hill to Lesser Dominant status was prompted by a Trimble GeoXH 6000 survey and confirmed by susequent LIDAR analysis, resulting in a 361.0m summit height and a 239.5m bwlch height, with these values giving this hill 121.5m of drop and 33.65% of dominance.  Lesser Dominant total increases by one and confirmed as 285.

Gelli Hir    307.2m at SN 99903 88383

Gelli Hir (SN 999 883) replaces Y Gaer as the Lesser Dominant hill

This hill’s addition to Lesser Dominant status was confirmed by a survey with the Trimble GeoXH 6000 which took place on the 07.02.14, with the relevant post announcing the survey details being published on Mapping Mountains on the 08.02.14, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on the 29.12.17.  Prior to the survey with the Trimble GeoXH 6000 this hill’s twin 308m map heighted summit of Y Gaer which is positioned at SO 01350 87380 was prioritised as being listed as a Lesser Dominant, the subsequent survey separated these twin map heighted tops and a later survey with the Leica GS15 conducted on the 02.05.14 by John Barnard, Graham Jackson and Myrddyn Phillips substantiated this, resulting in a 307.2m (converted to OSGM15) summit height, which is 0.1m higher than its twin map heighted summit of Y Gaer, therefore with 124m of drop and 40.37% Dominance this hill is added to the Lesser Dominant list.  Lesser Dominant total increases by one and confirmed as 284.

Y Gaer    307.1m at SO 01350 87380

Y Gaer (SO 013 873) is replaced by Gelli Hir as the Lesser Dominant hill

The deletion of this hill from Lesser Dominant status was confirmed by a survey with the Trimble GeoXH 6000 which took place on the 07.02.14, with the relevant post announcing the survey details being published on Mapping Mountains on the 08.02.14, with a retrospective Hill Reclassifications post appearing on Mapping Mountains on the 28.12.17.  Prior to the survey with the Trimble GeoXH 6000 this hill was prioritised as a Lesser Dominant over its twin 308m map heighted summit of Gelli Hir which is positioned at SN 99903 88383, the subsequent survey separated these twin map heighted tops and a later survey with the Leica GS15 conducted on the 02.05.14 by John Barnard, Graham Jackson and Myrddyn Phillips substantiated this, resulting in a 307.1m (converted to OSGM15) summit height and 215.8m (converted to OSGM15) bwlch height, giving this hill 91.4m of drop and 29.74% Dominance, which is insufficient for its continued inclusion as a Lesser Dominant.  Lesser Dominant total decreases by one and confirmed as 283.

Pen Twmp    217m at SM 988 329

This hill’s reclassification from Dominant to Lesser Dominant status took place after 22.03.12 and was retrospectively reported on Mapping Mountains with a Hill Reclassifications post on the 09.08.18.  The hill had previously been classified with 50.69% Dominance based on the 217m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 107m based on interpolation of bwlch contouring between 105m – 110m, this drop value was amended when the Ordnance Survey Interactive Coverage Map hosted on the Geograph website became available online, and as this scale of mapping shows a 109m spot height on the area of this hill’s bwlch this amended the drop value of the hill to 108m and its Dominance to 49.77% and it was therefore reclassified from a Dominant to a Lesser Dominant hill.  This hill has subsequently been analysed via LIDAR resulting in a 108.3m bwlch height and its reinstatement as a Dominant hill (see above).  Lesser Dominant total increases by one and confirmed as 284.

Cae Quarry    70.9m at SN 50644 20918

LIDAR image of Cae Quarry (SN 506 209)

The reclassification of this hill from Dominant to Lesser Dominant status took place after 22.03.12 and was retrospectively reported on Mapping Mountains with a Hill Reclassifications post on the 04.03.18.  The hill had previously been classified with 50.00% Dominance based on the 68m summit spot height and an estimated bwlch height of c 34m, with the latter based on 10m contour intervals on the Ordnance Survey 1:25,000 Explorer map, this drop value was amended when the Ordnance Survey Interactive Coverage Map hosted on the Geograph website became available and was examined, and as this scale of mapping has 5m contour intervals for the area surrounding this hill it altered its drop value to an estimated c 31m, and its Dominance to 45.59%.  The hill was subsequently analysed via LIDAR, resulting in a 70.9m summit height and a 36.1m bwlch height, with these values giving this hill 34.8m of drop and 49.04% dominance.  Lesser Dominant total increases by one and confirmed as 283.

31^st November 2012 – Compilation of hand written list completed of Y Trechol – The Dominant Hills of Wales.

Lesser Dominant total confirmed as 282.

11^th April 2011 – Started compilation of hand written list of Y Trechol – The Dominant Hills of Wales.

Lesser Dominant total confirmed as 282.

23^rd April 2009 – Criteria established and first hill purposely bagged that met the criteria of Y Trechol – The Dominant Hills of Wales.

Lesser Dominant total confirmed as 282.

Myrddyn Phillips (August 2017)