Pevensey Levels is a 3,603.2 ha biological Site of Special Scientific Interest between Bexhill-on-Sea and Hailsham in East Sussex. It is a Nature Conservation Review site, Grade I, a Ramsar site and a Special Area of Conservation. An area of 183.5 ha is a national nature reserve and an area of 150 ha is a nature reserve called Pevensey Marshes which is managed by the Sussex Wildlife Trust. This is a large area of wetland grazing meadows intersected by a network of ditches. It has many nationally rare invertebrates. It may be the best site in Britain for freshwater mollusc fauna, including the endangered shining ram's-horn snail. It also has one nationally rare and several nationally scarce aquatic plants and it is of national importance for lapwing, with more than 1% of the British population.