Caves of the Mendip Hills traverse from one cave to another through the underground rivers led to the development of cave diving; the first cave dive attempt in Britain took place at Swildon's Hole in 1934. The first successful cave dive in Britain was achieved the following year at Wookey Hole Caves, where the last sump is currently the deepest in Britain at . The cave complexes at St. Dunstan's Well Catchment, Thrupe Lane Swallet, Lamb Leer and Priddy Caves have been identified as geological Site of Special Scientific Interest. There are also caves within the Cheddar Complex SSSI. A selection of the better known
Edington, Somerset was 2,375. It is also part of the Bridgwater and West Somerset county constituency represented in the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament (MP) by the first past the post system of election, and part of the South West England constituency of the European Parliament which elects seven MEPs using the d'Hondt method of party-list proportional representation. Catcott, Edington and Chilton Moors SSSI is a 1083 hectare biological Site of Special Scientific Interest consisting of land south of the River Brue managed by Somerset Wildlife Trust and is known for