Ogof y Daren Cilau | |
---|---|
Location | Llangattock escarpment |
OS grid | SO20521530 |
Depth | 192 m (630 ft) |
Length | 27 km (16.8 mi) |
Entrances | 2 |
Difficulty | tortuous entrance series |
Access | free |
Translation | Cave of the outcrop with [many] nooks (Welsh) |
Cave survey | zoomable plan drawing |
Ogof y Daren Cilau is a cave system in the limestone escarpment on Mynydd Llangatwg (Llangattock Mountain), which is south of Llangattock village and above Crickhowell in south Powys, Wales.[1] The escarpment is the remnant of quarrying that had begun by the mid-18th century and initially provided limestone for building and agriculture as a fertiliser, and subsequently for the blast furnaces of the local ironworks as a flux.[2] The cave system was discovered in 1957 and is one of the longest in the United Kingdom. The system is next to the Ogof Agen Allwedd system.