Ogof Ffynnon Ddu
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Ogof Ffynnon Ddu, also known informally as OFD, is a cave under a hillside in the area surrounding Penwyllt in the Upper Swansea Valley in South Wales. It is the second longest cave in Wales and the d
The main streamway of OFD 2.
Penwyllt
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Penwyllt is a hamlet located in the upper Swansea Valley in Powys, Wales, lying within the Brecon Beacons National Park.
Ogof Ffynnon Ddu
…Ogof Ffynnon Ddu (Welsh for cave of the black spring), also known informally as OFD, is a cave under a hillside in the area surrounding Penwyllt in the Upper Swansea Valley in South Wales. It is the second longest cave in Wales and the deepest in the United Kingdom. OFD was discovered in 1946…
Powell Street, Penwyllt (2005)