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Chesil Beach /ˈtʃɛzɨl/, sometimes called Chesil Bank, in Dorset, southern England is one of three major shingle structures in Britain. Its toponym is derived from the Old English ceosel or cisel, meaning "gravel" or "shingle".
The beach is often identified as a tombolo, although research into the geomorphology of the area has revealed that it is in fact a barrier beach which has "rolled" landwards, joining the mainland with the Isle of Portland, giving the appearance of a tombolo. The shingle beach is 29 kilometres (18 mi) long, 200 metres (660 ft) wide and 15 metres (50 ft) high. The beach and the Fleet are part of the Jurassic Coast, a UNESCO World Heritage Site, and the location for a 2007 novel, On Chesil Beach by Ian McEwan.