Ogof Foel Fawr is situated near the top of the hill above Herbert's Quarry on the Brynamman to Llangadog road (map). From the cave entrance you descend into a large passage, which leads to an awkward climb down into a blind pit and is followed by a climb up into a passage that soon degenerates into a series of crawls and squeezes. A very tight squeeze over a fallen slab leads to a final awkward squeeze through a perched calcite pool to link into Ogof Pasg and affords a through trip for the slim and agile caver.
