Foulness SSSI Foulness SSSI Foulness SSSI is a 10,702 hectare biological Site of Special Scientific Interest covering the shoreline between Southend-on-Sea and the Crouch estuary in Essex. It is a key site in "A Nature Conservation Review", and is part of the Essex Estuaries Special Area of Conservation. It covers two Ramsar wetland sites of international importance, 'Crouch and Roach Estuaries' and 'Foulness'. An area of 6.4 hectares is Shoeburyness Old Ranges, a Local Nature Reserve managed by the Essex Wildlife Trust. Most of the site is owned and managed by the Ministry of Defence. Natural England describes it as "extensive intertidal
Ruapuke Island cliffy promontory rising to a hummock, high. Close to the westernmost point, on the peninsula separating Lagoon Bay and Henrietta Bay, the island reaches its highest point, above sea level. It is these two hummocks which give the island its name. The eastern coast is dominated by two long, generally straight beaches to the north, and a series of smaller coves to the south. Between the longer beaches and smaller coves lies an inlet, the mouth of the only river system on the island. A smaller island, Green Island, some in extent, lies off the central east coast, and another