Cheddar Gorge a tourist destination. In a 2005 poll of "Radio Times" readers, following its appearance on the 2005 television programme "Seven Natural Wonders", Cheddar Gorge was named as the second greatest natural wonder in Britain, surpassed only by Dan yr Ogof caves. The gorge attracts about 500,000 visitors per year. Cheddar is a gorge lying on the southern edge of the Mendip Hills. The maximum depth of the gorge is , with a near-vertical cliff-face to the south, and steep grassy slopes to the north. The B3135 road runs along the bottom of the gorge. The area is underlain by Black
Wookey Hole Caves Farr a few days later for at a maximum depth of to emerge in the 25th chamber, a desolate, muddy place named "The Lake of Gloom". The 25th chamber represents the furthest upstream air surface in Wookey Hole Cave. From here the River Axe rises up from a deep sump where progressive depth records for cave diving in the British Isles have been set: firstly by Farr () in 1977, then Rob Parker () in 1985, and finally by John Volanthen and Rick Stanton () in 2004. The pair returned again in 2005 to explore the sump to a depth