Y Pedwarau - The 400m Hills of Wales

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1	© 2013 - 2017 Myrddyn Phillips and Aled Williams. 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 authors.
2	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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5	Y Pedwarau - The 400m Hills of Wales. Welsh hills at or above 400m and below 500m in height with 30m minimum drop.
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8	Including five categories of Sub hills:
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10	500m Sub-Pedwarau - Welsh hills at or above 500m and below 510m in height with 30m minimum drop.
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12	500m Double Sub-Pedwarau - Welsh hills at or above 500m and below 510m in height with 20m or more and below 30m of drop.
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14	400m Sub-Pedwarau - Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.
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16	390m Sub-Pedwarau - Welsh hills at or above 390m and below 400m in height with 30m minimum drop.
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18	390m Double Sub-Pedwarau - Welsh hills at or above 390m and below 400m in height with 20m or more and below 30m of drop.
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23	Y Pedwarau (Carneddau)
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25	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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27	Crimpiau	473.2	North Wales Region A	A1	115	17	Creigiau Gleision	SH 73296 59564	LIDAR		86.9	Numerical Data: 473.2m summit height and 386.3m bwlch height (86.9m drop) from LIDAR analysis conducted by Myrddyn Phillips.
28	Clip yr Orsedd	426.6	North Wales Region A	A1	115	17	Tal y Fan	SH 71185 74743	Trimble GeoXH 6000		39.2	Numerical Data: 426.6m summit height from a Trimble GeoXH 6000 survey and 387.4m bwlch height (39.2m drop) from LIDAR analysis conducted by Myrddyn Phillips and Aled Williams, with LIDAR also giving a higher 387.6m bwlch position on the valley to valley traverse at SH 71803 74674 which is a part of a raised track that is considered a relatively recent man-made construct and therefore discounted from the drop value of this hill.
29	Pt. 416.9m	416.9	North Wales Region A	A1	115	17	Creigiau Gleision	SH 74560 58930	Trimble GeoXH 6000		79.5	Numerical Data: 416.9m summit height and 337.4m bwlch height (79.5m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
30	Waun Bryn Gwenith	415.1	North Wales Region A	A1	115	17	Carnedd Llywelyn	SH 74728 67409	LIDAR		65.55	Numerical Data: 415.1m summit height and 349.5m bwlch height (65.55m drop) from LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips, with LIDAR also giving a higher 349.6m bwlch position on the valley to valley traverse at SH 73799 66908 which is a part of a raised road that is considered a relatively recent man-made construct and therefore discounted from the drop value of this hill.
31	Moel Faban	408.7	North Wales Region A	A1	115	17	Carnedd Llywelyn	SH 63418 67984 (S)	Trimble GeoXH 6000		46	408.7m summit height and 362.7m bwlch height (46.0m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
32	Clogwyn Manod	403.6	North Wales Region A	A1	115	17	Creigiau Gleision	SH 74169 59314	Trimble GeoXH 6000		43.9	Numerical Data: 403.6m summit height from a Trimble GeoXH 6000 survey and 359.7m bwlch height (43.9m drop) from LIDAR analysis conducted by Myrddyn Phillips.
33	Mynydd Deulyn	400.1	North Wales Region A	A1	115	17	Creigiau Gleision	SH 75936 61265	Trimble GeoXH 6000		108.5	Numerical Data: 400.1m summit height from a Trimble GeoXH 6000 survey and 291.6m bwlch height (108.5m drop) from LIDAR analysis conducted by Myrddyn Phillips.
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35	500m Sub-Pedwarau (Carneddau)
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37	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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39	Cefn Cyfarwydd	501.7	North Wales Region A	A1	115	17	Creigiau Gleision	SH 75201 63067	Trimble GeoXH 6000		30.7	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.
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41	500m Double Sub-Pedwarau (Carneddau)
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43	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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45	Pen y Gadair	507	North Wales Region A	A1	115	17	Carnedd Llywelyn	SH 73348 69363	hand-held GPS via DoBIH	c	20
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47	400m Sub-Pedwarau (Carneddau)
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49	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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51	Pt. 403.8m	403.8	North Wales Region A	A1	115	17	Creigiau Gleision	SH 74675 59467	Trimble GeoXH 6000		28.7	Numerical Data: 403.8m summit height from a Trimble GeoXH 6000 survey and and 375.1m bwlch height (28.7m drop) from LIDAR analysis conducted by Myrddyn Phillips.
52	Craig Celynin	404.8	North Wales Region A	A1	115	17	Tal y Fan	SH 74667 73373	Trimble GeoXH 6000		27.7	Numerical Data: 404.8m summit height and 377.1m bwlch height (27.7m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips with the bwlch position ascertained from LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips.
53	Pt. 480.4m	480.4	North Wales Region A	A1	115	17	Carnedd Llywelyn	SH 73806 64585	LIDAR		24.7	Numerical Data: 480.4m summit height and 455.7m bwlch height (24.7m drop) from LIDAR analysis conducted by Myrddyn Phillips.
54	Foel Dduarth	446	North Wales Region A	A1	115	17	Carnedd Llywelyn	SH 68124 71455	LIDAR		20.3	446.0m summit height and 425.7m bwlch height (20.3m drop) from LIDAR analysis conducted by Aled Williams.
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56	390m Double Sub-Pedwarau (Carneddau)
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58	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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60	Penmaen Mawr	390.4	North Wales Region A	A1	115	17	Tal y Fan	SH 69865 75523	Trimble GeoXH 6000		26.9	390.4m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams and 363.5m bwlch height (26.9m drop) from LIDAR analysis initially conducted by Aled Williams and subsequently by Myrddyn Phillips.
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66	Y Pedwarau (Glyderau)
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68	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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70	Moel Berfedd	482	North Wales Region A	A1	115	17	Glyder Fawr	SH 65151 55686	hand-held GPS via DoBIH	c	70
71	Moelyci	409.9	North Wales Region A	A1	114, 115	17	Y Garn	SH 59083 65767	Trimble GeoXH 6000		72.9	Numerical Data: 409.9m summit height from a Trimble GeoXH 6000 survey and 336.9m bwlch height (72.9m drop) from LIDAR analysis conducted by Myrddyn Phillips, with LIDAR giving a higher 337.1m bwlch position on the valley to valley traverse at SH 59634 63967 which is a part of a raised field boundary that is considered a relatively recent man-made construct and therefore discounted from the drop value of this hill.
72	Parc Drysgol	404.2	North Wales Region A	A1	114, 115	17, 263	Y Garn	SH 58927 64456	LIDAR		62.1	Numerical Data: 404.2m summit height from LIDAR analysis and 342.1m bwlch height (62.1m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
73	Moel Rhiwen	401.5	North Wales Region A	A1	114, 115	17, 263	Y Garn	SH 58141 64300	Trimble GeoXH 6000		43.2	Numerical Data: 401.5m summit height and 358.3m bwlch height (43.2m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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79	Y Pedwarau (Yr Wyddfa)
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81	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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83	Cefn Du	442	North Wales Region A	A1	114, 115	17, 254, 263	Moel Eilio	SH 54845 60381	hand-held GPS via DoBIH	c	71	Triangulation pillar with 441.350m flush bracket height situated on the summit area.
84	Pt. 420.5m	420.5	North Wales Region A	A1	115	17	Yr Wyddfa	SH 64165 54564	LIDAR		39.1	420.5m summit height and 381.4m bwlch height (39.1m drop) frpm LIDAR analysis conducted by Aled Williams.
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86	400m Sub-Pedwarau (Yr Wyddfa)
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88	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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90	Derlwyn	416.4	North Wales Region A	A1	115	17	Yr Wyddfa	SH 58856 58610	Trimble GeoXH 6000		20.4	416.4m summit height and 396.0m bwlch height (20.4m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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96	Y Pedwarau (Moel Hebog)
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98	Name	Summit Height (m)	Region	Sub-Region	1:50,000 map	1:25,000 map	Cardinal Hill	Summit Grid Reference	Summit Grid Reference extracted from		Drop (m)	Notes
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100	Y Gurn	459	North Wales Region A	A1	115	17, 254	Pt. 734m	SH 55265 50093	hand-held GPS via DoBIH	c	55	459m summit height taken from the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map.