Chesil Beach (also known as Chesil Bank) in Dorset, England, is one of three major shingle beach structures in Britain. Behind the beach is the Fleet, a shallow tidal lagoon.
The beach runs for a length of 29 kilometres (18 mi) from West Bay to the Isle of Portland and in places is up to 15 metres (50 ft) high and 200 metres (660 ft) wide. It is almost entirely made of stone shingle, and the typical size of stones reduces along the length of the beach. The beach is often identified as a tombolo, although research has revealed that it is in fact a barrier beach.