Agen Allwedd
Agen Allwedd, along with Daren Cilau, dominates the underworld of the Llangattock escarpment. With over 30km of surveyed passages there are a multitude of different trips and sights to experience, from impressive and sculpted dry passages and fine formations to sporting streamways and exciting climbs, there’s something for everyone. Agen Allwedd (or Aggy, as it’s affectionately known), is also a very important bat roosting site with several hundred Lesser Horseshoe bats over-wintering within the cave.
Access
Access is available to any bona fide caving clubs with membership to BCRA or similar body. Information rescued in 2019 from the currently offline MLCMAC (Mynydd Llangatwg Cave Management Advisory Committee) website is available below. Please note that some of this information is slightly out of date, but the contacts and access procedures are still valid:
CSS members can access the cave at any time using the club keys held at Whitewalls.
Location
NGR: SO 18768 15861 - what3words: ///exploring.leotard.phantom
Aggy is located along the tramroad footpath, and is roughly a 25 minute walk from Whitewalls. Leaving the cottage simply follow the gravel track until it becomes a footpath then stay on this as it contours around the cliff edges, ignoring the footpath sign heading downhill along the way. You’ll pass a few other caves, the most obvious being Eglwys Faen with its multiple entrances just beyond the information board. Aggy is a gated entrance low on the cliff face at the far end of the track.



Other Popular Trips in Aggy
- Priory Road, Iles Inlet and The Courtesan - A well decorated and impressive part of the cave. This can be reached by following the Main Stream Passage, but the quickest/easiest route is via Southern Stream Passage.
- Maytime - This is a huge impressive stream passage, leading to Sump 4. This is best reached by Southern Stream Passage, and should be avoided in wet weather.
- Sand Caverns - A really interesting part of the cave with large passages and fine formations.
A survey for the cave is available for purchase from CSS at Whitewalls. More photos and descriptions of some of the routes are available on the ogof.org.uk website.