Ogof Ffynnon Ddu

Ogof Ffynnon Ddu, the Cave of the Black Spring, commonly known to the lazy or non-welsh as OFD, is the nearest cave to the club, lying almost under the cottages. There are 3 entrances to the OFD system within easy walking distance of the cottage - the OFD I or bottom entrance, the Cwm Dwr entrance and the OFD II or top entrance.  Please see the access information for OFD to plan a trip.

For the full experience without leaving your chair, look at the Virtual Tour at: www.ogof.net or view the members' pictures.

OFD is Britain's third longest cave as well as being its deepest at 308 m deep. The trip from the top entrance to the bottom entrance is the deepest through trip in Britain at 228 m. The cave is formed on several levels with in general large breakdown passages at the upper level and a streamway at the bottom level which occasionally becomes a sump level. Passages connecting the levels generally descend steeply and almost all are rift controlled. The cave is decorated throughout with many different styles of calcite decorations.   The routes though the cave are too numerous to mention, but the simplified survey below locates some of the main points.  Copies of the full survey are available from SWCC HQ. 

More background info on Ogof Ffynnon Ddu is here. Conservation article from Welsh Country Magasine.

Small OFD Survey