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© 2013 - 2016 Myrddyn Phillips. Non-commercial copying is permitted provided attribution is preserved. Re-use of the presented data in this or another format requires the permission of the author.
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Contains OS Data © Crown copyright and database rights 2016, licensed under the OGL (see at http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ ).
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Y Trechol - The Dominant Hills of Wales. Those Welsh P30 summits whose prominence equal or exceed half that of their absolute height.
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Including - The Lesser Welsh Dominants. Those additional P30 summits whose prominence is between one third and half that of their absolute height.
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Group 1: Mynydd Twr
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Name
Dominance
Summit Height (m)1:50,000 Map1:25,000 MapGrid Reference SummitSummit Grid Reference extracted fromDrop (m) Summit to BwlchGrid Reference BwlchBwlch Grid Reference extracted fromDrop (m) Bwlch to ODNNotes
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Mynydd Twr100.00%220.1114262SH 21853 82945LIDAR220.1N/AN/AN/APlace Name Information: Hill name written as Mynydd Tŵr on contemporary Ordnance Survey maps with the English name of Holyhead Mountain also being given. Numerical Data: 220.1m summit height from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 220.370m flush bracket height situated on the summit area. Listing History: First published listing - The Relative Hills of Britain published in 1992 by Cicerone Press and compiled by Alan Dawson.
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Yr Arwydd100.00%177.5114263SH 47242 85417Trimble GeoXH 6000177.5N/AN/AN/ANumerical Data: 177.5m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Triangulation pillar with 178.003m flush bracket height situated on the summit area at SH 47243 85417. Listing History: First published listing - The Relative Hills of Britain published in 1992 by Cicerone Press and compiled by Alan Dawson.
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Ynys Lawd100.00%42.8114262SH 20224 82265Trimble GeoXH 600042.8N/AN/AN/APlace Name Information: Alternate hill name of South Stack also given on contemporary Ordnance Survey maps. Numerical Data: 42.8m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Cadair Pedwar Gwynt93.02%63.7114262SH 26346 75302LIDAR59.3SH 25393 79147LIDAR4.45Place Name Information: Cadair Pedwar Gwynt is a locally known name for the summit of this hill, with an alternate locally known name being Lady Verney's Seat. Numerical Data: 63.7m summit height and 4.45m bwlch height (59.3m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 62.944m flush bracket height situated on the summit area at SH 26343 75314. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Bwrdd Arthur83.63%164.7114263SH 58577 81284Trimble GeoXH 6000137.8SH 51561 77533LIDAR27.0Numerical Data: 164.7m summit height from a Trimble GeoXH 6000 survey and 27.0m bwlch height (137.8m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 164.287m flush bracket height situated on the summit area at SH 58570 81288. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
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Dinas Gynfor78.21%69.3114262SH 39115 95044Trimble GeoXH 600054.2SH 39280 94837Trimble GeoXH 600015.1Numerical Data: 69.3m summit height and 15.1m bwlch height (54.2m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Mynydd Eilian69.86%176.9114263SH 47282 91719Trimble GeoXH 6000123.6SH 42808 86451LIDAR53.3Numerical Data: 176.9m summit height from a Trimble GeoXH 6000 survey and 53.3m bwlch height (123.6m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 177.393m flush bracket height situated on the summit area at SH 47283 91720. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
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Mynydd y Garn62.35%170114262SH 31497 90679hand-held GPS via DoBIHc106SH 34775 88547interpolationc64Place Name Information: Hill name written as Mynydd-y-Garn on the contemporary Ordnance Survey 1:25,000 Explorer map. Numerical Data: Triangulation pillar with 170.078m flush bracket height situated on the summit area at SH 31493 90674. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
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Pen Bryn yr Eglwys56.79%81114262SH 29314 92444hand-held GPS via DoBIHc46SH 30115 92027interpolationc35Place Name Information: Hill name written as Penbrynyreglwys on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Graig Wen54.33%91.3114262SH 39734 94739Trimble GeoXH 600049.6SH 41984 91871LIDAR41.7Numerical Data: 91.3m summit height from a Trimble GeoXH 6000 survey and 41.7m bwlch height (49.6m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 91.107m flush bracket height situated on the summit area at SH 39809 94701. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Glan y Morfa52.85%59.2114, 115263SH 43819 67923LIDAR31.3SH 45679 69377LIDAR27.9Place Name Information: The bounded land where the summit of this hill is situated is named Glan y Morfa on the Tithe map for the parish of Llangeinwen. Numerical Data: 59.2m summit height and 27.9m bwlch height (31.3m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - Update to the 30m - 99m Twmpau and Y Trechol - The Dominant Hills of Wales published in March 2021 on the Mapping Mountains site and compiled by Myrddyn Phillips.
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Sotherby Top50.92%130.4114, 115263SH 48871 83632LIDARc66
SH 46734 82741
interpolationc64Place Name Information: Hill name written as Sotheby Top on the contemporary Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map. Numerical Data: Conjecture as to summit position which is immersed in a dense blackthorn wood with partial LIDAR coverage giving 130.4m at SH 48871 83632, the Ordnance Survey Vector Map Local hosted on the Geograph website giving a 131m spot height at SH 48790 83528, Magic Maps giving a 130m spot height at SH 48837 83602. Two points were surveyed with the Trimble GeoXH 6000 giving 130.0m at SH 48775 83504 and 129.7m at SH 48924 83526. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Ponciau Tre Wilmot50.41%76.6114262SH 22772 81657LIDARc39SH 21685 81120interpolationc38Place Name Information: Ponciau Tre Wilmot is a locally known name for this hill. Numerical Data: 76.6m summit height from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Pen y Foel50.21%122.5114, 115263SH 42575 84415Trimble GeoXH 6000c62SH 44053 82788interpolationc61Numerical Data: 122.5m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Llanlleiana Park49.85%68.2114262SH 38337 94993Trimble GeoXH 600034SH 38745 94536Trimble GeoXH 600034.2Place Name Information: The bounded land where the summit of this hill is situated is named Llanlleiana Park on the Tithe map for the parish of Amlwch. Numerical Data: 68.2m summit height and 34.2m bwlch height (34.0m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Mynydd Parys46.69%148.1114263SH 44268 90538LIDAR69.1SH 46045 90623LIDAR78.9Place Name Information: Hill name written as Parys Mountain on contemporary Ordnance Survey maps. Numerical Data: 148.1m summit height and 78.9m bwlch height (69.1m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 147.611m flush bracket height situated on the summit area at SH 44312 90544. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Plas Gwyn44.91%76.1114, 115263SH 52494 81743Trimble GeoXH 600034.2SH 52209 81404LIDAR41.9Place Name Information: Plas Gwyn is a locally known name for this hill. Numerical Data: 76.1m summit height from a Trimble GeoXH 6000 survey and 41.9m bwlch height (34.2m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Cefn Cwmwd42.93%84.5114, 115263SH 43440 74193Trimble GeoXH 600036.3SH 42185 75141LIDAR48.3Numerical Data: 84.5m summit height from a Trimble GeoXH 6000 survey and 48.3m bwlch height (36.3m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 83.774m flush bracket height situated on the summit area at SH 43300 74028. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Pt. 88m40.91%88114262SH 31119 86934hand-held GPS via DoBIH36SH 32093 87850spot height52Numerical Data: 88m summit height and 52m bwlch height taken from the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Mynydd Llwydiarth36.45%158.1114, 115263SH 54126 78707Trimble GeoXH 600057.6SH 55284 79340LIDAR100.5Place Name Information: Summit is situated in the Pentraeth Forest. Numerical Data: 158.1m summit height from a Trimble GeoXH 6000 survey and 100.5m bwlch height (57.6m drop) from LIDAR analysis conducted by Myrddyn Phillips, with LIDAR giving a 158.5m summit at SH 54083 78685. Triangulation pillar with 158.496m flush bracket height situated on the summit area at SH 54034 78670. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Mynydd Bach33.66%96.5114262, 263SH 38964 76773Trimble GeoXH 6000c32SH 40259 77918interpolationc64Place Name Information: Mynydd Bach is a locally known name for this hill. Numerical Data: 96.5m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Group 2: Carnedd Llywelyn
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Name
Dominance
Summit Height (m)1:50,000 Map1:25,000 MapGrid Reference SummitSummit Grid Reference extracted fromDrop (m) Summit to BwlchGrid Reference BwlchBwlch Grid Reference extracted fromDrop (m) Bwlch to ODNNotes
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Ynys Seiriol100.00%58.6114, 115263SH 65050 81992Trimble GeoXH 600058.6N/AN/AN/APlace Name Information: Alternate hill names of Puffin Island and Priestholm also given on contemporary Ordnance Survey maps. Numerical Data: 58.6m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Cae Alen73.05%129.111517SH 78116 75814Trimble GeoXH 600094.3SH 77629 74003LIDAR34.8Place Name Information: The bounded land where the summit of this hill is situated is named Cae Alen on the Tithe map for the parish of Gyffin. Numerical Data: 129.1m summit height from a Trimble GeoXH 6000 survey and 34.8m bwlch height (94.3m drop) from LIDAR analysis conducted by Myrddyn Phillips, with Bryn Eithin (SH 77584 75224) surveyed as 128.5m in height and Bwlch Mawr (SH 77790 75561) surveyed as 128.4m in height. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
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Carnedd Llywelyn70.51%106411517SH 68364 64375hand-held GPS via DoBIH750SH 67558 60463Trimble GeoXH 6000313.7Place Name Information: Hill name written as Carnedd Llewelyn on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Numerical Data: 313.7m bwlch height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips with the position based on LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Coed Bodlondeb58.70%55.611517SH 77921 78114Trimble GeoXH 600032.6SH 77852 77725LIDAR22.9Place Name Information: Hill name also recorded by the Ordnance Survey as Bodlondeb and presented on contemporary maps as Bodlondeb Wood. Numerical Data: 55.6m summit height from a Trimble GeoXH 6000 survey and 22.9m bwlch height (32.6m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First Published Listing - Update to the Tumps published in August 2015 on the Hill Bagging website and compiled by Mark Jackson.
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Llys y Gwynt58.00%120.611517SH 77982 72884Trimble GeoXH 600070SH 76137 71943LIDAR50.7Place Name Information: The name of Llys y Gwynt is taken from the Ordnance Survey series of Six-Inch maps and substantiated by the Tithe map. Numerical Data: 120.6 summit height from a Trimble GeoXH 6000 survey and 50.7m bwlch height (70.0m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 100m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Creigiau Gleision38.94%67811517SH 72902 61540hand-held GPS via DoBIHc264SH 71690 60957interpolationc414Place Name Information: Hill name also recorded by the Ordnance Survey as Craig Gleision. Listing History: First published listing - The Mountains of Snowdonia published in 1925 by John Lane the Bodley Head Limited and compiled by Herbert R C Carr and George A Lister.
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Clytiau Poethion37.00%109.111517SH 76337 71799Trimble GeoXH 600040.4SH 77496 72493LIDAR68.7Place Name Information: The bounded land where the summit of this hill is situated is named Clylliau [sic] Poethion on the Tithe map for the parish of Caerhun. Numerical Data: 109.1m summit height from a Trimble GeoXH 6000 survey and 68.7m bwlch height (40.35m drop) from LIDAR analysis conducted by Myrddyn Phillips, with Maes Glas Mawr (SH 76876 72414) surveyed as 108.5m in height. Listing History: First published listing - Update to the 100m Twmpau and Y Trechol - The Dominant Hills of Wales published in February 2019 on the Mapping Mountains site and compiled by Myrddyn Phillips.
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Allt Wen36.51%252.311517SH 74546 77264Trimble GeoXH 600092.1SH 74855 77154Trimble GeoXH 6000160.2Place Name Information: Hill name written as Alltwen on the contemporary Ordnance Survey 1:50,000 Landranger map. Numerical Data: 252.3m summit height and 160.2m bwlch height (92.1m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 200m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Group 3: Glyder Fawr
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Name
Dominance
Summit Height (m)1:50,000 Map1:25,000 MapGrid Reference SummitSummit Grid Reference extracted fromDrop (m) Summit to BwlchGrid Reference BwlchBwlch Grid Reference extracted fromDrop (m) Bwlch to ODNNotes
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Glyder Fawr64.14%1000.911517SH 64242 57952Leica 530642SH 64751 55626spot height359Place Name Information: Hill name also recorded by the Ordnance Survey as Glydar Fawr, Y Glyder fawr, Glydr Mawr and Glyder fawr. Numerical Data: 1000.9m summit height from a Leica 530 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Penrhos Garnedd57.05%94114, 11517, 263SH 56027 70234Trimble GeoXH 600053.7SH 56305 70029LIDAR40.4Numerical Data: 94.0m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips, with the summit position based on LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips. 40.4m bwlch height from LIDAR analysis initially conducted by Aled Wlliams and subsequenty by Myrddyn Phillips. Listing History: First published listing - The Welsh 100m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Group 4: Yr Wyddfa
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Name
Dominance
Summit Height (m)1:50,000 Map1:25,000 MapGrid Reference SummitSummit Grid Reference extracted fromDrop (m) Summit to BwlchGrid Reference BwlchBwlch Grid Reference extracted fromDrop (m) Bwlch to ODNNotes
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Yr Wyddfa95.76%1084.811517SH 60985 54374OS historical data to bedlock at summitc1039NS 75816 78296interpolationc46Place Name Information: Also recorded by the Ordnance Survey by its English name of as Snowdon. Numerical Data: Ordnance Survey historical height data given as 1084.74m (1084.786m converted to OSGM15) to bedrock of mountain. 1086.7m height to man-made summit plinth from Leica Differential GPS survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. Old triangulation pillar with flush bracket height of 1086.002m now replaced with weather station fashioned as a circular trig pillar. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Coed Helen64.64%48.3114, 11517, 263SH 47595 62391LIDAR31.3SH 47721 62272LIDAR17.1Numerical Data: 48.3m summit height and 17.1m bwlch height (31.3m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Moel Eilio35.67%72611517, 254SH 55581 57718hand-held GPS via DoBIH259SH 57226 55864spot height467Listing History: First published listing - The Mountains of Snowdonia published in 1925 by John Lane the Bodley Head Limited and compiled by Herbert R C Carr and George A Lister.
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Group 5: Moel Hebog
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Name
Dominance
Summit Height (m)1:50,000 Map1:25,000 MapGrid Reference SummitSummit Grid Reference extracted fromGrid Reference BwlchBwlch Grid Reference extracted fromDrop (m) Bwlch to ODNNotes
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Ynys Hir91.21%37.312418, 254SH 56695 39693Trimble GeoXH 6000c34SH 56514 40152interpolationc3Place Name Information: An alternate locally known name for the hill is Bryn Percival (Information from The Islands of Traeth Mawr written by Aled Wlliams). Numerical Data: 37.3m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First published listing - Update to the 30m - 99m Twmpau and Y Trechol - The Dominant Hills of Wales published in July 2017 on the Mapping Mountains site and compiled by Myrddyn Phillips.
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Moel y Gest90.07%262.312418, 254SH 54923 38888LIDAR236.3SH 53834 39643LIDAR26.0Place Name Information: Hill name written as Moel-y-Gest on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Numerical Data: 262.3m summit height and 26.0m bwlch height (236.3m drop) from LIDAR analysis conducted by Myrddyn Phillips. Triangulation pillar with 262.127m flush bracket height situated on the summit area at SH 54924 38905. Listing History: First published listing - The Relative Hills of Britain published in 1992 by Cicerone Press and compiled by Alan Dawson.
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Dinas Dinlle88.22%34.7115, 123254SH 43676 56438Trimble GeoXH 600030.6SH 43922 55774LIDAR4.1Numerical Data: 34.7m summit height and 4.1m bwlch height (30.6m drop) from a Trimble GeoXH 6000 summit survey and LIDAR bwlch analysis conducted by Myrddyn Phillips. Listing History: First published listing - Update to the 30m - 99m Twmpau and Y Trechol - The Dominant Hills of Wales published in December 2013 on the Mapping Mountains site and compiled by Myrddyn Phillips.
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Moel Hebog74.71%78311517, 254SH 56481 46940triangulation pillarc585SH 57701 51329interpolationc198Numerical Data: Triangulation pillar with 783.031m flush bracket height situated on the summit area. 783m summit height taken from the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Mynydd Mawr66.33%69811517, 254SH 53970 54689bolt463SH 55884 53342Trimble GeoXH 6000234.7Numerical Data: Summit height taken from the 697.687m bolt embedded in rock that is now destroyed. 234.7m bwlch height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. As the natural bwlch is now under the waters of Llyn y Dywarchen, the bwlch height is quoted as that of the surface water and its position to a concrete path over the stream on the dam wall, this position is deemed to be the nearest on dry land to that of the old natural critical bwlch. Listing History: First published listing - The Mountains of Snowdonia published in 1925 by John Lane the Bodley Head Limited and compiled by Herbert R C Carr and George A Lister.
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Castell Cricieth61.09%49.6123254SH 50003 37733Trimble GeoXH 600030.3SH 49943 38015Trimble GeoXH 600019.3Numerical Data: 49.6m summit height and 19.3m bwlch height (30.3m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - Update to the 30m - 99m Twmpau and Y Trechol - The Dominant Hills of Wales published in June 2015 on the Mapping Mountains site and compiled by Myrddyn Phillips.
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Carreg yr Eryr57.97%53.3124254SH 52627 37813Trimble GeoXH 600030.9SH 52976 37896Trimble GeoXH 600022.3Numerical Data: 53.3m summit height and 22.3m bwlch height (30.9m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Pt. 733.4m54.60%733.411517, 254SH 52555 50262Trimble GeoXH 6000c400SH 55309 49665interpolationc333Numerical Data: 733.4m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First published listing - The Mountains of Snowdonia published in 1925 by John Lane the Bodley Head Limited and compiled by Herbert R C Carr and George A Lister.
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Moelfre49.00%74.112418, 254SH 55830 37553Trimble GeoXH 600036.3SH 55625 37768Trimble GeoXH 600037.8Place Name Information: Moelfre is the locally known name for this hill. Numerical Data: 74.1m summit height and 37.8m bwlch height (36.3m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Moel y Gadair46.30%66.7124254SH 52165 39135Trimble GeoXH 600030.9SH 52013 39319LIDAR35.8Numerical Data: 66.7m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and 35.8m bwlch height (30.9m drop) from LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips, with LIDAR also giving a higher bwlch position on the valley to valley traverse of 36.8m positioned at SH 52007 39290 on an artifically raised road considered a relatively recent man-made construct and therefore discounted from the bwlch height of this hill. Listing History: First published listing - The Welsh 30m - 99m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Foel45.72%221.4115, 123254SH 45024 50679Leica GS15101.2SH 45826 50109Leica GS15120.2Numerical Data: 221.4m summit height and 120.2m bwlch height (101.2m drop) from a Leica GS15 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
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Bryniau Ystumcegid36.92%181.3124254SH 50595 41851LIDAR66.9SH 50911 41952LIDAR114.4Place Name Information: Hill name also recorded by the Ordnance Survey as Bryniau Ystumsegid. Numerical Data: 181.3m summit height and 114.4m bwlch height (66.9m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First published listing - The Welsh 100m Peaks published in 2004 on Geoff Crowder's v-g.me website and Mike Grant's 5everdene website and compiled by Myrddyn Phillips.
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Craig y Garn36.66%362.3124254SH 51088 44445LIDAR132.8SH 50911 45703LIDAR229.5Place Name Information: Hill name also recorded by the Ordnance Survey as Pen y Garn and written as Craig-y-garn on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Numerical Data: 362.3m summit height and 229.5m bwlch height (132.8m drop) from LIDAR analysis conducted by Myrddyn Phillips. Listing History: First known listing - The Yeamans of England + Wales compiled in 1992/1993 by E D 'Clem' Clements and first published on the RHB Yahoo Group file database in 2003.
100
Moel Ddu36.11%552.412418SH 57958 44205Trimble GeoXH 6000199.5SH 57581 44928Trimble GeoXH 6000353.0Place Name Information: Hill name written as Moel-ddu on contemporary Ordnance Survey maps. Numerical Data: 552.4m summit height and 353.0m bwlch height (199.5m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams with assistance from Mark Trengove. Listing History: First published listing - The Relative Hills of Britain published in 1992 by Cicerone Press and compiled by Alan Dawson.