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Chesil Beach is an 18 mile long pebble beach stretching north-west from Portland to West Bay. For much of its length it is separated from the mainland by an area of saline water called the Fleet Lagoon. The beach and the lagoon are important areas for wildlife with a number of national and international designations to help protect this important area. The area lies at the centre of the Jurassic Coast, a UNESCO designated World Heritage Site.