Pwll Dwfn

Pwll Dwfn - Wikipedia

Coordinates : 51°50′05″N 3°41′41″W / 51.83483°N 3.69480°W / 51.83483; -3.69480 Pwll Dwfn Pwll Dwfn entrance Location Tawe Valley , South Wales OS grid SN8332116494 Depth 97 metres (318 ft) Length 89 metres (292 ft) Geology Limestone Difficulty Fully