Ogof Agen Allwedd

51°50′09″N 3°10′50″W / 51.835723°N 3.180446°W / 51.835723; -3.180446

Ogof Agen Allwedd
The gated Ogof Gam entrance to Agen Allwedd cave.
Interactive map of Ogof Agen Allwedd
LocationLlangattock escarpment, Wales, United Kingdom
Length20 miles (32.5 km)
DiscoveryInitial discovery 1949, breakthrough in 1957.
GeologyLimestone
Entrances1
HazardsMain streamway flood prone
AccessMynydd Llangatwg Cave Management Advisory Committee
TranslationKeyhole Cave (Welsh)
Cave surveyChelsea Spelaeological Society
RegistryCambrian Cave Register

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.

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