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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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900m Twmpau
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Welsh hills at or above 900m and below 1000m in height with 30m minimum drop with a theoretical 900m Sub-Twmpau list taking in Welsh hills at or above 900m and below 1000m in height with 20m or more and below 30m of drop
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Carneddau
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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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Pen yr Ole Wen978.511517SH 65593 61939LIDAR45.2SH 65485 62205LIDAR933.4Numerical Data: 978.5m summit height and 933.4m bwlch height (45.2m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - The Mountains of Snowdonia published in 1925 by John Lane the Bodley Head Limited and compiled by Herbert R C Carr and George A Lister.
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Foel Grach975.411517SH 68878 65906Leica RX125041.8SH 68890 65282LIDAR933.7General Information: Emergency mountain refuge situated just below the summit. Numerical Data: 975.4m summit height from a Leica RX1250 survey conducted by Alan Dawson and 933.7m bwlch height (41.8m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Yr Elen963.311517SH 67384 65113LIDAR55.2SH 67652 64727LIDAR908.1Place Name Information: Also locally known by the colloquial alternative Yr Elan and recorded as Moel yr Elain by Thomas Pennant in 1781. Numerical Data: 963.3m summit height and 908.1m bwlch height (55.2m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Foel Fras944.111517SH 69611 68118Leica RX125062.8SH 68799 66515Leica RX1250881.3Place Name Information: Composition of hill name recorded as Foel-fras on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. Numerical Data: 944.1m summit height and 881.3m bwlch height (62.8m drop) from a Leica RX1250 survey conducted by Alan Dawson. Triangulation pillar with 943.051m flush bracket height situated on the summit area at SH 69652 68173. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Carnedd Uchaf925.011517SH 68698 66898Leica RX125033.0SH 69165 67331LIDAR892.0Place Name Information: The name Carnedd Gwenllian was accepted by the Ordnance Survey as an official name for this hill and announced on the 26/09/2009. Numerical Data: 925.0m summit height from a Leica RX1250 survey conducted by Alan Dawson and 892.0m bwlch height (33.0m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1929 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Glyder Fawr
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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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Glyder Fach994.311517SH 65641 58286Trimble GeoXH 600074.5SH 65272 58156Trimble GeoXH 6000919.8Numerical Data: 994.3m summit height and 919.8m bwlch height (74.5m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Embedded bolt in rock with 993.648m height situated on the aummit area at SH 65646 58285. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Y Garn946.4511517SH 63089 59568LIDAR234.4SH 63501 58493LIDAR712.0Numerical Data: 946.45m summit height and 712.0m bwlch height (234.4m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Elidir Fawr922.311517SH 61172 61288Trimble GeoXH 6000211.2SH 62566 61555LIDAR711.1Numerical Data: 922.3m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams and 711.1m bwlch height (211.2m drop) from LIDAR analysis conducted by Aled Williams. Embedded bolt in rock with 922.629m height situated on the aummit area at SH 61193 61301. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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Tryfan917.511517SH 66405 59387Leica 530191.1SH 66156 58775LIDAR726.4Numerical Data: 917.5m summit height from a Leica 530 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips and 726.4m bwlch height (191.1m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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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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Crib Goch924.011517SH 62418 55182Trimble GeoXH 600066.8SH 62168 55116LIDAR857.2Numerical Data: 924.0m summit height from the average of three Trimble GeoXH 6000 surveys conducted by Aled Williams and 857.2m bwlch height (66.8m drop) from LIDAR analysis conducted by Aled Williams. Listing History: First published listing - Twenty-Fives published in 1911 by the Rucksack Club Journal and compiled by John Rooke-Corbett.
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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
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Aran Fawddwy905.6124, 12523SH 86270 22386 (S)672.9SH 85050 26799 (S)uom232.7905.6m summit height from a Leica RX1250 survey conducted by Alan Dawson. Triangulation pillar with 906.780m flush bracket height situated on the summit area. 232.7m bwlch height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips, with the position based on LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips.
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