Caves of the Mendip Hills caves are listed below Caves of the Mendip Hills The caves of the Mendip Hills are formed by the particular geology of the Mendip Hills: large areas of limestone worn away by water makes it a national centre for caving. The hills conceal the largest underground river system in Britain. The hills consist of anticlines of Carboniferous Limestone lying over Devonian Old Red Sandstone, with the sandstone exposed on the summits. When a surface stream running off the sandstone reaches the limestone it sinks below ground through a "swallet", (also known locally as a "slocker"), continuing on its way down
Cheddar Gorge monuments as nationally important archaeological sites including: Gough's Old Cave, Great Oone's Hole, Saye's Hole, Soldier's Hole and Sun Hole. Cliff Road (B3135), which runs through the Gorge, offers a popular climb for bicyclists and has a maximum gradient of 16%. The ascent featured in stage 6 of the 2011 Tour of Britain. There are about 350 officially graded rock climbing routes on the 27 cliffs that make up Cheddar Gorge, which are generally open to climbers between 1 October and 15 March each year. Each of the routes is named and included in the British Mountaineering Council guidebook. Although