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 of the salting, after which rain washes the salt downwards. The alluvium which forms the soil is highly fertile once freshwater plants start to grow. The inning of New Wick Marsh added , and Arundel March covered . No new innings took place in the 1500s, as there were several exceptional tides, and activity was centred on maintaining the existing defences, but another was added between 1620 and 1662, and there was further activity between 1687 and 1688, in 1801, and finally in 1833. In total, were added to the island. The Broomway provided the main access to Foulness for