Twmpau - 700m P30 List
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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 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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Twmpau - 700m P30 List
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Carneddau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Pen Llithrig y Wrach798.611517
SH 71620 62288 (S)
180.3
SH 70954 62637 (S)
Bwlch y Tri Marchog618.3798.6m summit height and 618.3m bwlch height (180.3m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Summit height of 798.576m in the OS Trig Database at SH 71621 62289 given to a bolt embedded in rock that is now destroyed.
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Y Drum77111517
SH 70846 69590 (HH)
c46SH 70669 69042 (I)Bwlch y Gwrydc725Hill name written as Drum on current Ordnance Survey maps. Summit height taken from the 2,529ft (770.9m) levelled height on the Ordnance Survey 1:10,560 map.
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Trwsgl756.911517
SH 66387 67984 (S)
36.6
SH 66787 67818 (S)
uom720.3Name taken from the Y Pellennig booklet by Phillips/Williams (Europeaklist 2015). Hill name written as Drosgl on current Ordnance Survey maps. 756.9m summit height and 720.3m bwlch height (36.6m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Bera Mawr793.611517SH 67482 68270 (S)29.7SH 67513 68149 (S)uom763.9793.6m summit height and 763.9m bwlch height (29.7m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Glyderau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Gallt yr Ogof76311517
SH 68529 58569 (HH)
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SH 68183 58395 (SH)
uom721
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Yr Wyddfa
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Yr Aran747.211517
SH 60441 51532 (S)
c235SH 60528 52141 (I)Bwlch Cwm Llanc512Summit position and 747.3m height from a Leica Differential GPS survey conducted by G&J Surveys. Embedded bolt in rock with a 747.064m height situated on the summit area.
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Moel Eilio72611517, 254
SH 55581 57718 (HH)
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SH 57226 55864 (SH)
Bwlch Maesgwm467
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Llechog72011517SH 60613 56751 (S)28SH 60557 56634 (S)uom692.1720.0m summit height and 692.1m bwlch height (28.0m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Moel Hebog
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Moel Hebog78311517, 254
SH 56481 46940 (TP)
c585SH 57701 51329 (I)uomc198Triangulation pillar with 783.031m flush bracket height situated on the summit area. Summit height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Pt. 734m73411517, 254
SH 52559 50266 (HH)
c396SH 55310 49669 (I)Bwlch Cwm Trwsglc338
Bwlch name written as Bwlch Cwm-trwsgl on current Ordnance Survey maps.
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Trum y Ddysgl71011517, 254
SH 54487 51646 (HH)
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SH 53096 50734 (SH)
Bwlch Dros Bern501Summit height taken from the 2,329ft (709.9m) levelled height on the Ordnance Survey 1:10,560 map. Drop value taken from the 501m bwlch height on th Harvey 1:40,000 British Mountain Map.
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Garnedd Goch70111517, 254SH 51117 49521 (TP)25SH 51905 49987 (SH)uom676Hill name written as Garnedd-goch on current Ordnance Survey maps. Summit height taken from the 2,301ft (701.4m) levelled height on the Ordnance Survey 1:2,500 map. Triangulation pillar with 701.954m flush bracket height situated on the summit area. Drop value taken from the 676m bwlch height on the Harvey 1:40,000 British Mountain Map.
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yyy
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Moelwynion
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Moelwyn Mawr77012418
SH 65821 44859 (TP)
c385SH 69969 48626 (I)Bwlch y Gorddinanc385The bwlch is also known in English as the Crimea Pass on current Ordnance Survey maps. Triangulation pillar with 770.534m flush bracket height situated on the summit area.
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Moelwyn Bach71012418
SH 66032 43746 (HH)
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SH 66079 44091 (SH)
Bwlch Stwlan586Drop value taken from the 586m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Arennig
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Moel Llyfnant751124, 12518, 23
SH 80831 35188 (HH)
211
SH 81657 35419 (SH)
uom540
Drop value taken from the 540m bwlch height on the Harvey 1:25,000 Superwalker map.
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Rhobell Fawr73412423
SH 78679 25662 (TP)
304SH 82330 28626 (L)uom430Triangulation pillar with 734.568m flush bracket height situated on the summit area. Drop value taken from the 1,412ft (430.4m) levelled bwlch height on the Ordnance Survey 1:10,560 map.
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Rhinogydd
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Y Llethrc75512418
SH 66136 25777 (HH)
c560SH 69907 34682 (I)Llyn Trawsfynyddc195Summit height estimated from position of the 2,475ft (754.4m) levelled height on the Ordnance Survey 1:10,560 map in relation to highest point of hill.
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Diffwys750.312418
SH 66127 23413 (S)
147.6
SH 66613 24396 (S)
uom602.7Triangulation pillar with 750.722m flush bracket height situated on the summit area. 750.7m summit height and 602.7m bwlch height (147.6m drop) from a Leica GS15 Differential GPS survey conducted by G&J Surveys.
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Rhinog Fawr72012418
SH 65670 29006 (TP)
c363SH 66525 28190 (I)Bwlch Drws Ardudwyc357Bwlch name written as Bwlch Drws-Ardudwy on the current Ordnance Survey 1:25,000 Explorer map. Summit height taken from the 2,362ft (720.0m) levelled height on the Ordnance Survey 1:2,500 map. Triangulation pillar with 721.156m height situated on the summit area, with this height quoted as 'Ht to top of pillar' in the OS Trig Database, as there is no adjoined flush bracket on the trig pillar.
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Rhinog Fach71112418
SH 66487 27027 (HH)
c147SH 66558 26534 (I)uomc564Summit height taken from the 2,333ft (711.1m) levelled height on the Ordnance Survey 1:10,560 map.
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Aran
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid ReferenceBwlch Name / FeatureBwlch Height (m)Notes
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Pt. 779m779124, 12523
SH 83676 19459 (HH)
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SH 84139 19997 (S)
uom564Summit height taken from the 2,557ft (779.4m) levelled height on the Ordnance Survey 1:10,560 map. 564.0m bwlch height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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