L:16000
V:150

Dan-yr-Ogof, Under the Cave, Dan Yr Ogof Resurgence, Darren-yr-Ogof, Cliff of the Cave, Tarren yr Ogof


NGR: SN 83820 16000
225 m.asl

Powys , Northern Outcrop - West (Black Mountain)
map using leaflet map:
Rising Cave
Access The first part of the cave is a show cave and can easily be reach from the Sennybridge-Swansea road. The cave is owned by the Dan-yr-Ogof Cave Co. Ltd and the cave is managed for access by cavers by the Dan-yr-Ogof Cave Advisory Committee. Only parties accompanied by a Warden (Leader) appointed by DYOCAC may go beyond the show cave Current Access arrangements
Description First recorded exploration by the Morgan brothers in 1912, The river cave can be followed for 120 metres to a sump. The show cave is 520 metres long and leads to a series of four lakes beyond which is a complex series of passages and chambers ending in a long crawl. In 1966 a major extension to the cave was discovered some one mile in length. Two further extensions were subsequently discovered giving the cave a length of over 9 miles. The old cave and first part of the new extensions run in a SW direction, the known passages then running north.
History First explored by the Morgan Brothers 1912. Extended by The Dragon Group in 1939, SWCC, CDG 1964
Hydrology
Conservation
SSSI: 0854 Mynydd Du (Mixed) NNR: Dan-yr-Ogof GCR: 557
Survey
Old cave. G.Platten. 1938. Plan only. Private
Old cave, J.H.Davies. C.R.G. grade 4. 1952 Plan only. Private
Old cave based on various surveys with new additions, A.Coase C.R.G. Grade 4, Plan only. Limited publication
Provisional survey of 1966 series. D.Thomas C.R.G. Grade 1 and Plan only. Published privately
Show cave survey. N.S. Christopher 1967. C.R.G. Grade 6c Plan and section. unpublished
Wessex CC Jnl 109, 1967, p.141
Composite survey of all known cave. Plan only based on above surveys, A.Coase and D.Judson. Published. SWCC
BCRA Transactions, 1977
DYO Survey Data
References
Cambrian Travellers Guide, Nicholson, G., 3ed,p.4591813;;1840, "On the N. of the Tawe a little below the fall of the Tawney is Daren-yr-ogof, "the Rock of the Cave;" from this issues a very strong stream, but not equal in quantity to the spring at Ogmore, in Glamorganshire "
A General View of the Agriculture & Domestic Economy of S.Wales (London, 1814), Davies, W., v1.p.110"the peaty colour of the water at this time proved that it had connection with the turbary hollows...to the west"
The Geology of the South Wales Coalfield, Part V, A.Strahan, T.C. Cantrill, 1904, p.20
British Caver, 2, 1937, p.12, 42
Yorkshire Ramblers' Club Journal, Volume 7 Number 23, pp.52-61, Dan-Yr-Ogof and the Welsh Caves and 79-88, Cave Exploration
British Caver, 34, 1939, p.97
British Caver, 4, 1939, p.70
Dan-Yr-Ogof, 1939, early Cave Tourist Guidebook
British Caver, 5, 1940, p.21
British Caver, 6, 1941, p.50
British Caver, 6, 1941, p.57
British Caver, 11, 1943, p.57
SWCC, 1949
Cullingford, C.H.D. (1951) Exploring Caves,pp.74-75
SWCC Newsletter, July 1956
British Caver, 28, 1957, p.67
British Caver, 29, 1958, p.84
SWCC Newsletter 49, 1965, p.9
SWCC Newsletter 50, 1965, p.23
SWCC Newsletter 52, 1966, p.11
SWCC Newsletter 55, 1967, p.5
SWCC Newsletter 56, 1967, p.23
Wessex CC Jnl 109, 1967, pp.140-143
SWCC Newsletter 59, 1968, p.4
SWCC Newsletter 60, 1968, p.16
SWCC Newsletter 60, 1968, p.21
SWCC Newsletter 63, 1969, p.4
SWCC 64, 1969
SWCC Newsletter 65, 1970, p.1
SWCC Newsletter 67, 1970, p.9
Descent 10, 1970, p.12
Descent 12, 1970, p.3
SWCC Newsletter 69, 1971, p.33
SWCC Newsletter 71, 1972, p.6
SWCC 71, 1972, p.11
SWCC Newsletter 72, 1973, p.7
SWCC Newsletter 78, 1974, p.1
BCRA Transactions, Volume 4, No's 1 & 2, March 1977
SWCC Newsletter 91, 1979, p.2
Descent 40, 1979, p.40
Descent 53, 1983
Descent 60, 1984, p.6
Descent 92, 1990, p.8
Descent 96, 1990, p.9
SWCC Newsletter 105, 1989, p.35
Limestones and Caves of Wales, 1989, p.190
Red Dragon No. 23, p.11
SWCC Newsletter 106, 1990
Descent 97, 1991, p.7
Descent 100, 1991, p.8
Descent 102, 1991, p.12
Descent 107, 1992, pp.20-22, Brian Murlis, Pushing Dan yr Ogof [Mazeways; Corbel's Chamber; Battle of Britain]
SWCC Newsletter 110, 1992, p.6
Caves and Caving 56, Summer 1992, p.15
Descent 113, 1993, p.10
Caves and Caving, Summer 1993, p.6
SWCC Newsletter 112, 1993, p.28
SWCC Newsletter 112, 1993, p.40
SWCC Newsletter 115, 1995, p.34
Caves of South Wales, 1995, p.97
Caves and Caving, Spring 1996, p.6
SWCC Newsletter 118, 1996, p.106, Recalling 1966
SWCC Newsletter 118, 1996, p.161
SWCC Newsletter 118, 1996, p.190
Descent 128, 1996, p.10
Descent 133, 1997, p.10
Descent 135, 1997, p.11
Descent 138, 1997, p.14
Karst and Caves of Great Britain, 1997
Descent 146, p.10, Martyn Farr, Penetrating the void at Dan yr Ogof
Descent 181 p.14 (2005) Wigmore's dig
Geograph
Descent 202, p.10, Richard Frost, Explorations at Cascade Aven
Descent 204, p.18, Richard Frost, More exciting Dan yr Ogof discoveries [Chamber Pot Series]
Descent 205, p.13, Richard Frost, More Dan yr Ogof finds
Descent 206, p.19, Martyn Farr, Dan yr Ogof exploration
Descent 207, p.13, Martyn Farr, Dan yr Ogof
Descent 208, p.18, Richard Frost, Rottenstone revisited
Peter I.W.Harvey 2009 Early Days in Dan yr Ogof, and the Beginnings of OFD and SWCC
Descent 209, p.16, Richard Frost, Tortuous Windows
Descent 222, p.12, Richard Frost, Due west in Dan yr Ogof
Descent 222, p.12, Martyn Farr, Dan yr Ogof extensions [Battle of Britain & Gwyn Saunders Hall]
Descent 224, p.13, Richard Frost, The high and the mighty
Descent 225, p.14, Richard Frost, Reach for the sky
Brendan Marris Caves of South Wales
Cambrian Cave Registry entry 287
© Cambrian Caving Council ⓗ 2017