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.
^"Llangattock Escarpment, Brecon Beacons National Park, Powys". uksouthwest.net. Retrieved 24 November 2023.
OgofyDarenCilau is a cave system in the limestone escarpment on Mynydd Llangatwg (Llangattock Mountain), which is south of Llangattock village and above...
many miles of previously undiscovered underground passages (e.g. in OgofyDarenCilau and Noon's Hole). As an author and photographer,[citation needed]...
connected to the theoretical Llangattock System through OgofyDarenCilau. All the passages in Ogof Craig a Ffynnon occur in the Gilwern oolite which is...
tributaries of the River Neath Brecon Cathedral Ogof Agen Allwedd Ogof Craig a Ffynnon Ogof Ffynnon Ddu OgofyDarenCilau Centre for Alternative Technology, Machynlleth...
extensive cave systems which lie beneath it, notably those of OgofyDarenCilau and Ogof Agen Allwedd. These two systems are amongst the longest in Britain...
operated as a show cave. In the east of the park are the OgofyDarenCilau, Ogof Agen Allwedd and Ogof Draenen systems. Also of note, partly on account of...
In South Wales many kilometres of DarenCilau were first trodden by cave divers; and the link with Elm Hole and Pwll y Cwm was another major feat. In the...
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