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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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500m Twmpau
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Welsh hills at or above 500m and below 600m in height with 30m minimum drop with an accompanying 500m Sub-Twmpau list taking in Welsh hills at or above 500m and below 600m in height with 20m or more and below 30m of drop
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Carnedd Llywelyn
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Moel Wnion579.911517SH 64972 69708Trimble GeoXH 6000103.6SH 65201 68803Trimble GeoXH 6000476.3Numerical Data: 579.9m summit height and 476.3m bwlch height (103.6m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Triangulation pillar with 580.339m flush bracket height once situated on the summit area at SH 64966 69712 is recorded in the OS Trig Database as having been destroyed in September 2003. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Yr Orsedd557.211517SH 69352 71541LIDAR44.7SH 69550 71402LIDAR512.5Numerical Data: 557.2m summit height and 512.5m bwlch height (44.7m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Mountain tables published in 1995 by Constable and Company Limited and compiled by Michael Dewey.
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Craig Wen546.311517SH 72900 60279LIDAR48.1SH 72892 60459LIDAR498.2Numerical Data: 546.3m summit height and 498.2m bwlch height (48.1m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Moel Eilio546.111517SH 74734 65903LIDAR91.7SH 73906 64667LIDAR454.4Numerical Data: 546.1m summit height and 454.4m bwlch height (91.7m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - Mountain tables published in 1995 by Constable and Company Limited and compiled by Michael Dewey.
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Gyrn541.311517SH 64739 68792Trimble GeoXH 600045.1SH 64871 69070Trimble GeoXH 6000496.2Numerical Data: 541.3m summit height and 496.2m bwlch height (45.1m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Foel Ganol533.111517SH 68797 71588LIDAR38.2SH 69012 71563LIDAR495.0Place Name Information: Listed name written as Foel-ganol on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,0000 Explorer map. Numerical Data: 533.1m summit height and 495.0m bwlch height (38.2m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - Mountain tables published in 1995 by Constable and Company Limited and compiled by Michael Dewey.
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Cefn Cyfarwydd501.711517SH 75201 63067Trimble GeoXH 600030.7SH 74708 62751Trimble GeoXH 6000471.0Numerical Data: 501.7m summit height and 471.0m bwlch height (30.7m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First known listing - Kirk's BIG Mountain List compiled in 1997 by John Kirk. First published listing - Sub Deweys published in 2011 on the Hill Bagging website and compiled by the DoBIH.
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Pt. 588.9m588.911517SH 72654 63986LIDAR25.2SH 72590 63535LIDAR563.7Numerical Data: 588.9m summit height and 563.7m bwlch height (25.2m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - Welsh 500s compiled in 1999 by Dewi Jones. First published listing - Sub Deweys published in 2011 on the Hill Bagging website and compiled by the DoBIH.
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Pen y Gadair507.711517SH 73345 69359LIDAR21.7SH 73168 69152LIDAR486.0Place Name Information: Listed name written as Penygadair on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,0000 Explorer map. Numerical Data: 507.7m summit height and 486.0m bwlch height (21.7m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - Sub Deweys published in 2011 on the Hill Bagging website and compiled by the DoBIH.
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Yr Wyddfa
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Tryfan594.411517SH 59763 57873Trimble GeoXH 600024.6SH 59858 57775Trimble GeoXH 6000569.9Numerical Data: 594.4m summit height and 569.9m bwlch height (24.6m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First known listing - Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - Subdodds published in 2020 on the Hill Bagging website and compiled by the DoBIH.
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Tryfan577.211517SH 59636 58098Trimble GeoXH 600020.8SH 59683 57996Trimble GeoXH 6000556.4Numerical Data: 577.2m summit height and 556.4m bwlch height (20.8m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Listing History: First known listing - Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - Subdodds published in 2023 on the Hill Bagging website and compiled by the DoBIH.
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Moel Hebog
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Moel Ddu552.412418SH 57958 44205Trimble GeoXH 6000198.8SH 57528 44918LIDAR353.6Place Name Information: Composition of hill name recorded as Moel-ddu on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Numerical Data: 552.4m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams and 353.6m bwlch height (198.8m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Relative Hills of Britain published in 1992 by Cicerone Press and compiled by Alan Dawson.
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Bryn Bannog520.711517, 18SH 57608 45722LIDAR64.1SH 57409 46017LIDAR456.6Place Name Information: Composition of hill name recorded as Bryn Banog on the contemporary Ordnance Survey 1:25,000 Explorer map. Numerical Data: 520.7m summit height and 456.6m bwlch height (64.1m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - Mountain tables published in 1995 by Constable and Company Limited and compiled by Michael Dewey.
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Pt. 532.7m532.712418SH 57455 44182Trimble GeoXH 600028.9SH 57647 44157Trimble GeoXH 6000503.9Numerical Data: 532.7m summit height and 503.9m bwlch height (28.9m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams, with the bwlch position based on LIDAR analysis conducted by Aled Williams. Listing History: First known listing - Kirk's BIG Mountain List compiled in 1997 by John Kirk. First published listing - List of Possible 500 Metre Tops published in 2000 on Michael Dewey's website and compiled by Myrddyn Phillips and David Purchase.
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Yr Eifl
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Yr Eiffl560.7123253, 254SH 36482 44734Leica GS15431.3SH 45347 48678LIDAR129.4Numerical Data: 560.7m summit height from a Leica GS15 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips and 129.4m bwlch height (431.3m drop) from LIDAR analysis conducted by Aled Williams. Triangulation pillar with 564.184m flush bracket height situated on the summit area on top of a large ancient cairn at SH 36490 44743. Listing History: First published listing - The Supplement to A Selection of some 900 British and Irish Mountain Tops and A Selection of 1,000 Tops under 2,500 Feet Volume II printed by the Darien Press Ltd Edinburgh and published privately in 1962 and compiled by William McKnight Docharty.
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Gurn Ddu522.1115, 123254SH 40114 46783Trimble GeoXH 6000384.7SH 38808 44511LIDAR137.4Place Name Information: Listed name composition taken from the Cardinal Hill name in the Y Pedwarau booklet by Phillips/Williams (Europeaklist 2013), with the name written as Gyrn Ddu on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, with the name composition also recorded by Ordnance Survey as Y Gyrn-ddu. Numerical Data: 522.1m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and 137.4m bwlch height (384.7m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Bwlch Mawr510.4115, 123254SH 42673 47851Trimble GeoXH 6000147.7SH 41432 46648LIDAR362.7Numerical Data: 510.4m summit height from a Leica GS15 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips and a Trimble GeoXH 6000 survey conducted by John Fitzgerald and 362.7m bwlch height (147.7m drop) from LIDAR analysis conducted by Aled Williams. Triangulation pillar with 509.625m flush bracket height situated on the summit area at SH 42659 47850. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Moel Siabod
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Carnedd y Cribau591.511517SH 67617 53695Trimble GeoXH 600084.5SH 67647 54133Trimble GeoXH 6000507.0Numerical Data: 591.5m summit height and 507.0m bwlch height (84.5m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Clogwyn Bwlch y Maen547.111517SH 67908 54270Trimble GeoXH 600021.9SH 68011 54318Trimble GeoXH 6000525.2Place Name Information: Composition of listed hill name written as Clogwyn Bwlch-y-maen on the contemporary Ordnance Survey 1:50,000 Lannranger and 1:25,000 Explorer map. Numerical Data: 547.1m summit height and 525.2m bwlch height (21.9m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First known listing - Welsh Highlands - Uchafion Cymru compiled and authored by Myrddyn Phillips and Aled Williams.
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Moelwyn Mawr
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceSummit Grid Reference extracted fromDrop (m)Bwlch Grid ReferenceBwlch Grid Reference extracted fromBwlch Height (m)Notes
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Yr Arddu589.611517SH 67340 50702Trimble GeoXH 600039.2SH 66794 50034LIDAR550.45Numerical Data: 589.6m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and 550.45m bwlch height (39.2m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - The Mountain Walker's Guide to Wales published in 1990 by Gwasg Carreg Gwalch and compiled by Colin Adams.
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Pt. 554.65m554.6511517SH 68527 46407LIDAR30.6SH 68340 46610LIDAR524.1Numerical Data: 554.65m summit height from LIDAR analysis conducted by Aled Williams, with the524.1m bwlch height relative to a 30.6m level and staff line survey for drop conducted by John Barnard and Myrddyn Phillips. Listing History: First known listing - Kirk's BIG Mountain List compiled in 1997 by John Kirk. First published listing - update to the The 500-Metre Tops of England and Wales published in May 2000 on Michael Dewey's website.
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Moel Dyrnogydd525.711518SH 69544 49132LIDAR67.4SH 69503 48878LIDAR458.3Numerical Data: 525.7m summit height and 458.3m bwlch height (67.4m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The 500 Metre Tops of England and Wales compiled in 1985 by Tony Blackburn. First published listing - Mountain tables published in 1995 by Constable and Company Limited and compiled by Michael Dewey.
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Iwerddon582.711517SH 68819 48213LIDAR25.2SH 68405 47875LIDAR557.5Numerical Data: 582.7m summit height from LIDAR analysis conducted by Aled Williams, with the 557.5m bwlch height relative to a 25.2m level and staff line survey for drop conducted by John Barnard and Myrddyn Phillips. Listing History: First known listing - Kirk's BIG Mountain List compiled in 1997 by John Kirk. First published listing - update to the The 500-Metre Tops of England and Wales published in May 2000 on Michael Dewey's website.
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Craig Llyn Llagi597.311517SH 65246 48066LIDAR24.3SH 65279 47854LIDAR573.0Place Name Information: Composition of listed name recored by Ordnance Survey as Craig Llyn-llagi on the contemporary Ordnance Survey 1:25,000 Explorer map. Numerical Dara: 597.3m summit height and 573.0m bwlch height (24.3m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - A Pictorial Guide to the Mountains of Snowdonia 1: The Northern Peaks published in 2010 by Frances Lincoln and compiled by John Gillham.
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Cerrig Cochion548.911517SH 66250 51062Trimble GeoXH 600024.3SH 66174 51012Trimble GeoXH 6000524.6Numerical Data: 548.9m summit height and 524.6m bwlch height (24.3m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams. Listing History: First published listing - List of Possible 500 Metre Tops published in May 2000 on Michael Dewey's website and compiled by Michael Dewey, Myrddyn Phillips and David Purchase.
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Foel Ddu590.611517SH 66969 46024LIDAR24.1SH 66964 45746LIDAR566.5Numerical Dara: 590.6m summit height and 566.5m bwlch height (24.1m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - Welsh 500s compiled in 1999 by Dewi Jones. First published listing - update to the Sub Deweys published in 2012 on the Hill Bagging website and compiled by the DoBIH.
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Pt. 574.9m574.911517SH 66301 50001Trimble GeoXH 600022.0SH 66287 50113Trimble GeoXH 6000552.9Numerical Data: 574.9m summit height and 552.9m bwlch height (22.0m drop) from a Trimble GeoXH 6000 survey conducted by Aled Williams. Listing History: First known listing - The Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - 500m Twmpau published in 2015 on the Mapping Mountains website and compiled by Myrddyn Phillips.
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Craig Stwlan568.412418SH 66736 44654Trimble GeoXH 600020.1SH 66693 44717Trimble GeoXH 6000548.3Numerical Data: 568.4m summit height and 548.3m bwlch height (20.1m drop) from a Trimble GeoXH 6000 survey conducted by Aled Williams. Listing History: First known listing - The Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - Sub Deweys published in 2011 on the Hill Bagging website and compiled by the DoBIH.
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Pt. 511.7m511.711518SH 69325 48552 LIDAR20.0SH 69253 48542LIDAR491.7Numerical Data: 511.7m summit height and 491.7m bwlch height (20.0m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First known listing - The Welsh Highlands - Uchafion Cymru compiled in 2004 and authored by Myrddyn Phillips and Aled Williams. First published listing - update to the 500m Twmpau published in 2023 on the Mapping Mountains website and compiled by Myrddyn Phillips.
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Arenig
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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 Ro Wen* 598.611518
SH 74581 50009 (S)
* 120.7SH 73925 48085 (S)uom* 477.8598.6m summit height and 477.8m bwlch height (120.7m drop) from a Leica RX1250 survey conducted by Alan Dawson.