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.[1]
- ^ "Fact Sheet 8: Rivers" (PDF). Cheddar caves. Archived from the original (PDF) on 22 June 2006. Retrieved 27 January 2007.
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