, Northern Outcrop - East (Morlais to Abergavenny)
map using leaflet map:
Walk up the river bank for about 0.5 miles from Aberglais Bridge.
The entrance leads to a large passage which contains an active stream. This passage leads in to the main chamber and then to New Chamber. A small passage at the end of New Chamber leads to about 210m of bedding plane cave which then gives way to the main cave beyond a tight rift. The system contains a strong draught.
Liable to Flood.
SWCC 1950; BNSSS 1957; Cwmbran CC 1967
Entrance is actually outside the SSSI
SSSI: 0256 Nant Glais Caves (Geological)
British Caver 21, 1950
Cullingford,C.H.D. (1951), Exploring Caves, p.70
Journal Spel. Sub. Sec. BNS, 1959
Cave Sump Index, South Wales, Davies, M. , Dec. 1966
SWCC Newsletter 57, 323. Further Extensions
The Speleologist, 2, (13), 22. Report of further extensions and survey.
Cwmbran CC Journal, 1 (1), Dec. 1967
GSS nl Sep 1968, pp.2-4
Belfry Bulletin, 397, May 1981, Graham Wilton-Jones