Twmpau - 600m 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 - 600m 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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Creigiau Gleision67811517
SH 72902 61540 (HH)
c262SH 71690 60957 (I)Bwlch Cowlydc416Bwlch name taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Pt. 634m63411517
SH 73371 62252 (HH)
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SH 73249 62136 (SH)
uom598Drop value taken from the 598m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Tal y Fan* 610.011517
SH 72940 72653 (S)
* 189.6
SH 71446 71856 (S)
Bwlch y Ddeufaen* 420.5Summit position and 610.0m height from a Leica Differential GPS survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. 610.0m summit height and 420.5m bwlch height (189.6m drop) also from a Leica RX1250 survey conducted by Alan Dawson. Rebuilt triangulation pillar with no current flush bracket but with a 610.209m old flush bracket height situated on the summit area.
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Foel Lwyd* 600.111517
SH 72040 72326 (S)
* 53.3
SH 72653 72316 (S)
uom* 546.8The 600.1m summit height is an average of two Leica GNSS surveyes conducted independently by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica GS15 and Alan Dawson using a Leica RX1250, with the 546.8m bwlch height (53.3m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Pen y Castell* 623.511517SH 72187 68880 (S)* 29.0SH 71934 69032 (S)uom* 594.5Summit position and 29.0m drop value taken from an automatic level and staff survey conducted by Graham Jackson and Myrddyn Phillips, with the 623.5m summit height and 594.5m bwlch height (29.0m drop) from a Leica RX1250 survey independently conducted by Alan Dawson.
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Pt. 623m62311517SH 73056 60891 (HH)22SH 72877 61159 (I)uom601
Drop value taken from a 21.8m basic levelling survey conducted by Myrddyn Phillips.
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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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Moel Cynghorion67311517
SH 58610 56395 (HH)
c174SH 59101 55731 (I)Bwlch Cwm Brwynogc499Summit height taken from the 2,207ft (672.7m) levelled height on the Ordnance Survey 1:10,560 map.
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Foel Gron* 629.011517, 254
SH 56045 56847 (S)
* 30.7
SH 55891 57085 (S)
Bwlch Cwm Cesig* 598.3629.0m summit height and 598.3m bwlch height (30.7m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Pt. 609m608.7511517
SH 63498 55252 (S)
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SH 63329 55251 (SH)
Bwlch y Moch569Summit position and 608.75m height from a Leica Differential GPS survey conducted by Leica Geosystems and G&J Surveys.
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Foel Goch* 604.511517
SH 57096 56337 (S)
* 92.1
SH 56612 56351 (S)
uom* 512.4604.5m summit height and 512.4m bwlch height (92.1m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Craig Wen604.911517SH 59710 50850 (S)25.3SH 59896 51177 (S)uom579.6Summit position and 604.9m height from a Leica Differential GPS survey conducted by G&J Surveys. Drop value from a 25.3m automatic level and staff survey and a 579.6m bwlch height from a Leica Differential GPS survey conducted by G&J Surveys.
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Gallt y Wenallt61911517SH 64244 53269 (HH)24SH 63987 53426 (SH)uom595Drop value taken from the 595m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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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 Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Mynydd Mawr69811517, 254
SH 53970 54689 (B)
463
SH 55884 53342 (S)
Llyn y Dywarchen234.7Summit 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.
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Mynydd Drws y Coed69511517, 254
SH 54894 51820 (HH)
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SH 54756 51625 (SH)
uom638Hill name written as Mynydd Drws-y-coed on current Ordnance Survey maps. Drop value taken from the 638m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Moel yr Ogof65511517, 254
SH 55625 47864 (HH)
c117SH 55992 47496 (I)Bwlch Meillionenc538
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Mynydd Tal y Mignedd
65511517, 254
SH 53534 51402 (HH)
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SH 53825 51358 (SH)
uom602Hill name written as Mynydd Tal-y-mignedd on current Ordnance Survey maps. Summit height taken from the 2,148ft (654.7m) levelled height on the Ordnance Survey 1:10,560 map. Drop value taken from the 602m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website and from the Harvey 1:25,000 Superwalker map.
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Moel Lefn63811517, 254
SH 55295 48554 (HH)
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SH 55431 48164 (SH)
uom576
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Mynydd Graig Goch609.75115, 12317, 254
SH 49732 48518 (S)
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SH 50960 48794 (SH)
Bwlch Cwm Dulyn534Bwlch name written as Bwlch Cwmdulyn on current Ordnance Survey maps. Summit position and 609.75m height from a Leica Differential GPS survey conducted by Leica Geosystems and G&J Surveys. Drop value taken from the 534m bwlch height on the Harvey 1:40,000 British Mountain Map.
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Y Garn63411517, 254SH 55152 52649 (HH)21SH 55034 52234 (L)uom613Summit height taken from the 2,080ft (634.0m) levelled height on the Ordnance Survey 1:2,500 map. Drop value taken from the 2,011ft (613.0m) levelled bwlch height on the Ordnance Survey 1:2,500 map.
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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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Allt Fawr69811517
SH 68174 47463 (HH)
c242SH 66487 46238 (I)Bwlch y Rhosydd / Bwlch Cwmorthinc456
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Cnicht68911517
SH 64549 46618 (HH)
c106SH 65606 47744 (I)uomc583
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Moel Druman67611517
SH 67161 47645 (HH)
c59SH 67470 47611 (I)uomc617
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Pt. 672.2m* 672.211517
SH 66695 48120 (S)
* 58.4
SH 66854 47930 (S)
Llyn Terfyn* 613.8672.2m summit height and 613.8m bwlch height (58.4m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Ysgafell Wen* 669.411517
SH 66347 48534 (S)
* 31.4
SH 66316 48335 (S)
uom* 638.0669.4m summit height and 638.0m bwlch height (31.4m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Manod Mawr66212418
SH 72442 44666 (HH)
c264SH 79805 41427 (I)uomc398Summit height taken from the 661.720m surface bolt in block situated on the summit area. Triangulation pillar with no recorded flush bracket height once situated on the summit area has now been removed.
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Pt. 658m65811518
SH 72745 45850 (HH)
c66SH 72745 45405 (I)Llyn Pysgodc592
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Moel yr Hydd64811517, 18
SH 67212 45439 (HH)
c83SH 66769 45249 (I)uomc565Hill name written as Moel-yr-hydd on current Ordnance Survey maps.
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Moel Penamnen* 628.311518
SH 71627 48360 (S)
c138SH 73132 46742 (I)uomc490628.3m summit height from a Leica RX1250 survey conducted by Alan Dawson. The OS Trig Database gives a 628.497m bolt in block situated on the summit area.
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Moel Meirch* 608.911517
SH 66128 50358 (S)
* 60.1
SH 66387 49978 (S)
uom* 548.7608.9m summit height from a Leica Differential GPS survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. Embedded bolt in rock with 607.161m height situated just below the summit. 548.7m bwlch height (60.1m drop) from a Leica RX1250 survey conducted by Alan Dawson.
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Craig Ysgafn68912418SH 65997 44337 (HH)c25SH 65993 44582uomc664Hill name written as Craigysgafn on current Ordnance Survey maps.
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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 Fach689124, 12518
SH 82028 41595 (TP)
c295SH 78550 38683 (I)uomc394Hill name written as Arenig Fach on current Ordnance Survey maps. Triangulation pillar with 688.848m flush bracket height situated on the summit area.
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Carnedd y Filiast669124, 12518
SH 87115 44594 (TP)
c317SH 82644 44201 (I)uomc352
Triangulation pillar with 669.645m flush bracket height situated on the summit area.
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Y Dduallt662124, 12523
SH 81058 27374 (HH)
c138SH 79941 26474 (I)uomc524Hill name written as Dduallt on current Ordnance Survey maps.
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Pt. 619m619.412418, 23
SH 77858 34470 (S)
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SH 79253 36147 (SH)
Y Corsydd506Summit position and 619.42m height from a Leica Differential GPS survey conducted by G&J Surveys.
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Foel Goch61112518
SH 95383 42294 (HH)
c273SH 91746 43988 (I)uomc338
Triangulation pillar with 611.124m flush bracket height situated on the summit area.
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Carnedd Llechwedd Llyfn
643124, 12518SH 85781 44465 (SH)25SH 86012 44908 (SH)uom618Name composition taken from the Y Pellennig booklet by Phillips/Williams (Europeaklist 2015), with the hill name written as Carnedd Llechwedd-llyfn on current Ordnance Survey maps. Second summit of same map height at SH 85789 44665 on the Ordnance Survey enlarged mapping on the Geograph website. Drop value taken from the 618m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Rhinogydd
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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 Garn62912418
SH 70276 23029 (HH)
c316SH 68068 24272 (I)uomc313
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Moel Ysgyfarnogod62312418
SH 65845 34594 (HH)
c181SH 65877 29986Bwlch Tyddiadc442
Triangulation pillar with 623.316m flush bracket height situated on the summit area.
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Crib y Rhiw681.212418SH 66368 24868 (S)c28SH 66136 25245 (I)uomc653Name composition taken from the Y Pellennig booklet by Phillips/Williams (Europeaklist 2015), with the hill name written as Crib-y-rhiw on current Ordnance Survey maps. 681.2m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Foel Penolau61412418SH 66187 34837 (HH)c27SH 66099 34727 (I)uomc587Second summit of same map height at SH 66143 34773 on the Ordnance Survey enlarged mapping on the Geograph website.
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