Y Trechol - The Dominant Hills of Wales
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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 Mapping Mountains blog 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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Ynys Môn
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Name
Dominance
RegionSub-Region1:50,000 Map1:25,000 MapGrid Reference SummitHeight (m) SummitGrid Reference BwlchDrop (m) Summit to BwlchDrop (m) Bwlch to ODNNotes
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Mynydd Twr100.00%North Wales Region AA-1114262SH 21853 82945 (TP)220N/A220N/AHill name written as Mynydd Tŵr on current Ordnance Survey maps with the English name of Holyhead Mountain also being given. Triangulation pillar with 220.370m flush bracket height situated on summit area.
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Mynydd Bodafon100.00%North Wales Region AA-1114263SH 47243 85417 (TP)178N/A178N/ASummit name recorded as Yr Arwydd on current Ordnance Survey maps. Triangulation pillar with 178.003m flush bracket height situated on summit area.
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Ynys Seiriol100.00%North Wales Region AA-1114, 115263SH 65050 81992 (S)58.5N/A58.5N/AAlternate hill names of Puffin Island and Priestholm also given on current Ordnance Survey maps. 58.5m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Ynys Lawd100.00%North Wales Region AA-1114262SH 20226 82245 (SH)41N/A41N/AAlternate hill name of South Stack also given on current Ordnance Survey maps.
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Cadair Pedwar Gwynt93.65%North Wales Region AA-1114262SH 26348 75310 (HH)63
SH 25676 79066 (SH)
594Cadair Pedwar Gwynt is a locally known name for the summit of this hill, with an alternate locally known name being Lady Verney's Seat. Triangulation pillar with 62.944m flush bracket height situated on summit area. 4m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Bwrdd Arthur82.32%North Wales Region AA-1114, 115263SH 58579 81289 (HH)164
SH 51589 77561 (I)
c135c29Triangulation pillar with 164.287m flush bracket height situated on summit area.
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Dinas Gynfor78.21%North Wales Region AA-1114262SH 39115 95044 (S)69.3
SH 39280 94837 (S)
54.215.169.3m summit height and 15.1m bwlch height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Mynydd Eilian69.49%North Wales Region AA-1114263SH 47283 91720 (TP)177
SH 42889 86501 (SH)
12354Triangulation pillar with 177.393m flush bracket height situated on summit area.
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Mynydd y Garn62.35%North Wales Region AA-1114262SH 31496 90679 (HH)170
SH 34775 88547 (I)
c106c64Hill name written as Mynydd-y-Garn on current Ordnance Survey 1:25,000 maps. Triangulation pillar with 170.078m flush bracket height situated on summit area.
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Penbrynyreglwys58.02%North Wales Region AA-1114262SH 29314 92442 (HH)81
SH 30123 92035
c47c34
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Graig Wen52.57%North Wales Region AA-1114262SH 39734 94739 (S)91.3
SH 41982 91836 (I)
c48c43Triangulation pillar with 91.107m flush bracket height situated on summit area. 91.3m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Sotherby Top51.15%North Wales Region AA-1114, 115263SH 48782 83511 (HH)131
SH 47064 83493 (I)
c67c64Hill name written as Sotheby Top on the current Ordnance Survey enlarged mapping on the Geograph website. 131m summit height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Ponciau Tre Wilmot50.65%North Wales Region AA-1114262SH 22775 81661 (HH)77
SH 21942 81205 (I)
c39c38Ponciau Tre Wilmot is a locally known name for this hill. 77m summit height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Pt. 68m49.85%North Wales Region AA-1114262SH 38337 94993 (S)68.2SH 38745 94536 (S)3434.268.2m summit height and 34.2m bwlch height (34.0m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Pen y Foel49.59%North Wales Region AA-1114, 115263SH 42576 84420 (HH)123
SH 43810 82367 (SH)
6162123m summit height and 62m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Pt. 64m46.88%North Wales Region AA-1114, 115263SH 49160 76085 (HH)64SH 49038 76692 (I)c30c34
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Mynydd Parys46.23%North Wales Region AA-1114263SH 44304 90558 (S)147.1SH 45139 91008 (I)c68c79Hill name written as Parys Mountain on current Ordnance Survey maps. Triangulation pillar with 147.611m flush bracket height situated on summit area. 147.1m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. There are a number of positions where this hill's critical bwlch could be placed, including at SH 45997 90608, SH 45139 90769 and SH 44991 91008.
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Pt. 78m44.87%North Wales Region AA-1114, 115263SH 52589 81742 (HH)78SH 52228 81530 (I)c35c43
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Pt. 84m42.86%North Wales Region AA-1114, 115263SH 43460 74196 (SH)84
SH 42087 75148 (SH)
3648Triangulation pillar with 83.774m flush bracket height situated on summit area. 48m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website and the 1:50,000 Landranger map.
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Maes Maethlu40.91%North Wales Region AA-1114262SH 31117 86932 (HH)88
SH 32093 87850 (SH)
365288m summit height and 52m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Mynydd Llwydiarth37.34%North Wales Region AA-1114, 115263SH 54123 78710 (HH)158SH 55287 79345 (I)c59c99Summit is situated in the Pentraeth Forest. Triangulation pillar with 158.496m flush bracket height situated on summit area.
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Pt. c 97m35.05%North Wales Region AA-1114262, 263SH 38959 76764 (HH)c97SH 40259 77918 (I)c34c6399m spot height to top of Covered Reservoir on the Ordnance Survey enlarged mapping on the Geograph website.
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Carneddau
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Name
Dominance
RegionSub-Region1:50,000 Map1:25,000 MapGrid Reference SummitHeight (m) SummitGrid Reference BwlchDrop (m) Summit to BwlchDrop (m) Bwlch to ODNNotes
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Iolyn Park73.85%North Wales Region AA-111517SH 77793 75567 (HH)c130
SH 77693 74072 (SH)
c9634Land situated at SH 77588 75222 and at SH 78114 75810 could be as high as the listed summit.
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Carnedd Llywelyn70.49%North Wales Region AA-111517SH 68364 64375 (HH)1064
SH 67527 60499 (SH)
750314Hill name written as Carnedd Llewelyn on current Ordnance Survey maps. 314m bwlch height taken from the Ordnance Survey 1:50,000 Landranger map and the Harvey 1:25,000 Superwalker map.
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Bodlondeb Wood59.65%North Wales Region AA-111517SH 77923 78114 (I)c57
SH 77945 77607 (I)
c34c23
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Pt. c 116m55.17%North Wales Region AA-111517SH 77971 72899 (HH)c116
SH 76153 71939 (SH)
c6452
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Creigiau Gleision38.64%North Wales Region AA-111517SH 72902 61540 (HH)678SH 71690 60957 (I)c262c416Hill name also recorded by the Ordnance Survey as Craig Gleision.
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Pt. 107m36.45%North Wales Region AA-111517SH 76969 72509 (HH)107SH 77492 72492 (I)c39c68107m summit height taken from the Ordnance Survey 1:50,000 Landranger map. Land situated at SH 76338 71811 could be as high as the listed summit position.
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Allt Wen36.08%North Wales Region AA-111517SH 74547 77270 (HH)255SH 74923 77149 (I)c92c163Hill name written as Alltwen on current Ordnance Survey 1:50,000 Landranger maps.
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Glyderau
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Name
Dominance
RegionSub-Region1:50,000 Map1:25,000 MapGrid Reference SummitHeight (m) SummitGrid Reference BwlchDrop (m) Summit to BwlchDrop (m) Bwlch to ODNNotes
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Glyder Fawr64.15%North Wales Region AA-111517SH 64246 57958 (S)1000.8
SH 64751 55626 (SH)
642359Hill name also recorded by the Ordnance Survey as Glydar Fawr, Y Glyder fawr, Glydr Mawr and Glyder fawr. 1000.8m summit height from a Leica Differential GPS survey conducted by G&J Surveys.
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Penrhosgarnedd52.08%North Wales Region AA-1114, 11517, 263SH 55969 70081 (I)c96
SH 56081 69741 (I)
c50c46Composition of hill name ascertained from 'A Gazetteer of Welsh Place-Names.' Hill name written as Penrhos Garnedd on current Ordnance Survey maps.
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Yr Wyddfa
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Name
Dominance
RegionSub-Region1:50,000 Map1:25,000 MapGrid Reference SummitHeight (m) SummitGrid Reference BwlchDrop (m) Summit to BwlchDrop (m) Bwlch to ODNNotes
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Yr Wyddfa95.79%North Wales Region AA-111517SH 60985 54374 (B)1084.7
NS 76813 78583 (SH)
103946The hill name is also given as Snowdon on current Ordnance Survey maps. Ordnance Survey historical height data given as 1084.74m to bedrock of mountain. 1086.67m height to man-made summit plinth from Leica Differential GPS survey conducted by G&J Surveys. Old triangulation pillar with flush bracket height of 1086.002m now replaced with weather station fashioned as a circular trig pillar.
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Coed Helen64.58%North Wales Region AA-1114, 11517, 263SH 47601 62399 (HH)48
SH 47701 62199 (I)
c31c17
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Moel Eilio35.67%North Wales Region AA-111517, 254SH 55581 57718 (HH)726
SH 57226 55864 (SH)
259467
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Moel Hebog
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Name
Dominance
RegionSub-Region1:50,000 Map1:25,000 MapGrid Reference SummitHeight (m) SummitGrid Reference BwlchDrop (m) Summit to BwlchDrop (m) Bwlch to ODNNotes
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Dinas Dinlle92.16%North Wales Region AA-1115, 123254SH 43676 56438 (S)34.7
SH 43958 56249 (I)
c32c334.7m summit height from Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Ynys Hir91.21%North Wales Region AA-112418, 254SH 56695 39693 (S)37.3
SH 56514 40152 (I)
c34c3An alternate locally known name for the hill is Bryn Percival (Information from 'The Islands of Traeth Mawr' by Aled Wlliams). 37.3m summit height from Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Moel y Gest89.73%North Wales Region AA-112418, 254SH 54927 38894 (HH)263
SH 53819 39655 (SH)
23627Hill name written as Moel-y-Gest on current Ordnance Survey maps. Triangulation pillar with 262.127m flush bracket height situated on summit area. 27m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website, with a 26m spot height similarly positioned on the Ordnance Survey 1:50,000 Landranger map.
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Moel Hebog74.71%North Wales Region AA-111517, 254SH 56481 46940 (TP)783
SH 57701 51329 (I)
c585c198Triangulation pillar with 783.031m flush bracket height situated on summit area. 783m summit height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Mynydd Mawr66.33%North Wales Region AA-111517, 254SH 53970 54689 (B)698
SH 55884 53342 (S)
463234.7Summit height taken from the 697.687m bolt embedded in rock that is now destroyed. 234.7m bwlch height from 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.
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Castell Cricieth61.09%North Wales Region AA-1123254SH 50003 37733 (S)49.6
SH 49943 38015 (S)
30.319.349.6m summit height and 19.3m bwlch height from Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Carreg yr Eryr57.97%North Wales Region AA-1124254SH 52627 37813 (S)53.3
SH 52976 37896 (S)
30.922.353.3m summit height and 22.3m bwlch height from Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Pt. 734m53.95%North Wales Region AA-111517, 254SH 52559 50266 (HH)734
SH 55310 49669 (I)
c396c338
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Moelfre49.00%North Wales Region AA-112418, 254SH 55830 37553 (S)74.1SH 55625 37768 (S)36.337.8Moelfre is the locally known name for this hill, and it remains unnamed on Ordnance Survey maps. 74.1m summit height and 37.8m bwlch height from Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Foel45.72%North Wales Region AA-1115, 123254SH 45024 50679 (S)221.4SH 45826 50109 (S)101.2120.2221.4m summit height and 120.2m bwlch height from Leica Differential GPS survey conducted by G&J Surveys.
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Craig y Garn36.36%North Wales Region AA-1124254SH 51090 44450 (HH)363SH 50917 45718 (I)c132c231Hill name also recorded by the Ordnance Survey as Pen y Garn. Hill name written as Craig-y-garn on current Ordnance Survey maps.
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Bryniau Ystumcegid36.11%North Wales Region AA-1124254SH 50599 41854 (HH)c180
SH 50932 41902 (SH)
c65115Hill name also recorded by the Ordnance Survey as Bryniau Ystumsegid [sic].
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Moel Ddu35.80%North Wales Region AA-112418SH 57965 44213 (HH)553
SH 57574 44928 (SH)
198355Hill name written as Moel-ddu on current Ordnance Survey maps. 355m bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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