Ogof Agen Allwedd, Cave system in Llangattock, Wales.
Ogof Agen Allwedd is an extensive cave system with over 30 kilometers of surveyed passages featuring large stream corridors, boulder-filled sections, and diverse limestone formations. The network connects multiple natural openings in the cliff face.
The cave was known to local people for centuries, but in 1957 the Hereford Caving Club broke through the First Boulder Choke and opened up vast new sections. This breakthrough greatly expanded understanding of the region's underground geology.
The cave serves as a winter shelter for hundreds of Lesser Horseshoe bats, which depend on its stable conditions for survival. Visitors can sense the importance of this underground habitat as they move through the passages.
Access is through a gated entrance on the cliff face at the end of the Tramroad footpath and requires signing in at the logbook before entry. Allow several hours for exploration as passages are lengthy and physically demanding, so come prepared for an extended underground adventure.
The cave contains named chambers such as the Music Room, Swiss Village, and Southern Stream Passage, with titles given by cavers to reflect distinctive features they encountered. These names reveal how explorers interpreted the landscape they discovered underground.
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