St Cuthbert's Swallet
The 28th longest cave in the world
7.1km · Length
St Cuthbert's Swallet is the second longest, and most complex, cave on the Mendip Hills, in Somerset, England. It forms a major part of the Priddy Caves system and water entering this swallet re-emerges at Wookey Hole. St Cuthbert's Swallet is part of, and lies underneath, the Priddy Pools Site of Special Scientific Interest. It is named because of its location in the St Cuthbert Out parish of Wells, and was originally called St Cuthbert's Pot.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).