Will's Hole, Will's Cave, Dinas Rock Cave, King Arthur's Cave, Craig-y-Ddinas Cave, Craig-y-Dinas Cave, Wills Hole

NGR: SN 91470 08013
128 m.asl

Rhondda Cynon Taff , Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
Access Approach from Glynneath via Pont-Nedd-Fechan to the road bridge over the river Mellte near Dinas Rock., where vehicles may be parked. From the bridge, follow the track ESE along the North bank of the River Sychryd for 425m to the base of where the ramp once was. Go up the gorge 28m and climb up a short distance on the left (looking upstream) to the terrace in front of the cave entrance, in the base of the cliff.
Description The entrance is about 1m square, facing the gorge. It consists of a short 3m pitch leading to a passage 15m long with a further pitch of 15m to twin passages, joined together at the end. The common passage leads to the sump at the West end (the same level as Ogof Pont Sychryd). The East end used to communicate with Ogof Coed-y-Ffyrnau, verbally. The working of the silica mine has caused the floor of the cave to be raised many feet by silt and chippings and for the sump to be completely blocked, so that in flood, the small stream creates a lake which takes some time to seep out. The East end has likely digs in the boulder chokes. There are some massive blocks of tufa bridging the rift-like passage. It is about 160m and 80m long in the respective passages, with several likely passages above and below. This was probably the underground route of the River Sychryd before the railway mineral track blocked up the sink. It's waters appear in Ogof Pont Sychryd and the resurgence into the river Mellte (Sychryd means dry ford, the river having been known to be dry).
History 1938
SAM: BR229/178 SSSI: 1434 Dyffrynoedd Nedd a Mellte a Moel Penderyn (Mixed)

Brendan Marris
Wessex CC, Greenwood & Trower, 1938
BUSS 1972, Caves of the Sychryd Valley
Caves and Caving 1 (3), 93-98, 1938
Wessex CC Circular No.52/ Supplement No.5, L.W.Greenwood & A.M.G.Trower, 1940
British Caver 6, 1-6, 1940
British Caver 6, 44, 53, 1940
British Caver 9, 62, 1942
British Caver 12, 17-20, 1944
British Caver 26, 37-43, 1955
CRG Newsletter 39, 2-3, 1952
British Caving, pp.67,85,142, Cullingford,C.H.D.,2nd ed., 1962
HCC Newsletter 13, 12
HCC Newsletter 3, 12-13, 1952
HCC Newsletter 5, 7 1953
HCC Newsletter 7, 3-4
HCC Newsletter 8, 7
Jenkins .........
North, F.J. River Scenery at the Head of the Vale of Neath 3rd ed. (Nat. Museum of Wales), 3rd ed. 1949 & 4th ed. 1962
SWCC Circular, p.5, 1951
SWCC Newsletter ‚'Our Caves' No.3, 10
SWCC Newsletter ‚'Our Caves' No.4, 11-12
SWCC Newsletter 11, 8, 1955
SWCC Newsletter 11, 8, 1955
SWCC Newsletter 29, 13, 1959, Bill Harris, Completing the Circuit at Will's Hole [vocal connection to surface where stream from Silica Mine sinks]
SWCC Newsletter 45, 21, 1963
Trans. Cardiff Nat. Hist. Soc. 61, p.12-54 1928
The Caves and Mines of the Sychryd Gorge, Jones,K.
SWCC Newsletter 122, pp.12-20, 1963, Keith Ball, Caves of the Sychryd Gorge
CDG nl.140 (2001), Wills Hole
Brendan Marris Caves of South Wales
BGS Archives: BCRA/201W/B/29
Cambrian Cave Registry entry 491
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