Twmpau - 800m 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 - 800m 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 Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Llwytmor84911517
SH 68948 69228 (HH)
73
SH 69180 69014 (SH)
uom776
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Pen yr Helgi Du832.611517
SH 69776 63049 (S)
84.7SH 69439 63342 (S)Bwlch Eryl Farchog747.8832.6m summit height and 747.8m bwlch height (84.7m 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 Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Foel Goch83111517
SH 62861 61214 (HH)
c78SH 62706 60212 (I)uomc753Hill name written as Foel-goch on current Ordnance Survey maps.
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Carnedd y Filiast82111517
SH 62041 62739 (HH)
c75SH 61994 61535 (I)Bwlch y Marchlync746
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Y Foel Goch80511517
SH 67784 58219 (HH)
c63SH 67254 58244 (I)Llyn Caseg-fraithc742
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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 Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Y Lliwedd89811517
SH 62245 53339 (HH)
154
SH 61961 53701 (SH)
Bwlch Ciliau744Hill name written as Y Lliwedd West Peak on current Ordnance Survey maps.
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Pt. 893m, Y Lliwedd89311517SH 62405 53254 (HH)c20SH 62294 53271 (I)uomc873Hill name written as Y Lliwedd East Peak on current Ordnance Survey maps.
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Lliwedd Bach81811517SH 62754 53232 (HH)20SH 62672 53199 (I)uom798
Drop value taken from a basic levelling survey conducted by John and Anne Nuttall.
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Moelwynion
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Moel Siabod87211518
SH 70529 54635 (HH)
600
SH 66071 55625 (SH)
uom272Triangulation pillar with 872.337m flush bracket height situated on the summit area. Drop value taken from the 272m 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 Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Arennig Fawr854
124, 125
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SH 82703 36947 (TP)
479
SH 66526 52249 (SH)
Bwlch Rhediad375Hill name written as Arenig Fawr on current Ordnance Survey maps. Triangulation pillar with 854.049m flush bracket height situated on the summit area.
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Pt. c 838m, Arennig Fawrc838124, 12518SH 82688 36658 (HH)c24SH 82674 36785 (I)uomc814
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Aran
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Aran Benllyn885
124, 125
23
SH 86721 24313 (HH)
c51SH 86452 23733 (I)uomc834
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Erw y Ddafad Ddu872
124, 125
23
SH 86478 23388 (HH)
c37SH 86208 22593 (I)uomc835Hill name written as Erw y Ddafad-ddu on current Ordnance Survey maps.
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Y Berwyn
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Craig Berwyn832125255SJ 07163 32351 (S)c346SJ 01637 30538 (I)Milltir Gerrigc486832.0m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Moel Sych826.7125255SJ 06627 31858 (S)33.9SJ 06944 32140 (S)uom792.7826.7m summit height and 792.7m bwlch height (33.9m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Cadair Idris
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Cadair Idris89312423
SH 71111 13035 (TP)
608
SH 75701 13951 (SH)
Bwlch Llyn Bach285The summit of this hill is also known as Pen y Gadair. Triangulation pillar with 893.368m flush bracket height situated on the summit area. Emergency mountain refuge situated just below the summit.
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Mynydd Moel86312423
SH 72750 13682 (HH)
67
SH 72047 13420 (SH)
uom796
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Cyfrwy81112423
SH 70384 13339 (SH)
c33SH 70530 13064 (I)uomc778The hill is also named by its English translation of The Saddle on current Ordnance Survey maps.
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Y Mynydd Du
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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