Ogof Agen Allwedd | |
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Location | Llangattock escarpment, Wales, United Kingdom |
Length | 20 miles (32.5 km) |
Geology | Limestone |
Ogof Agen Allwedd or Agen Allwedd, is, at 20.2 miles (32.5 km), one of the longest cave systems in Wales, and the longest cave system on the Llangattock escarpment.