Ogof Ffynnon Ddu
| Use attributes for filter ! | |
| Depth | 274 m |
|---|---|
| Length | 50 km |
| Cave survey | 1 |
| Access | South Wales Caving Club |
| Geology | Limestone |
| Entrance | 3 |
| Date of Reg. | |
| Date of Upd. | |
| ID | 1043311 |
About Ogof Ffynnon Ddu
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 deepest in the United Kingdom.
Ogof Ffynnon Ddu Photos
