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
Foulness Island below the island, and a well was constructed on Great Shelford Marsh. It reached a depth of , but no water was found. At the end of the 1700s, Francis Bannester, who owned Rushley Island nearby, attempted to find water by boring, but again failed to do so. However, his son, also called Francis, persisted and found fresh water some below Rushley in 1828. Just six years later, there were more than 20 such springs scattered through the six islands of which Foulness is one, and fourteen farms on the island had their own wells by 1889. Evidence for housing