Pevensey Levels is a 3,603.2-hectare (8,904-acre) biological Site of Special Scientific Interest between Bexhill-on-Sea and Hailsham in East Sussex.

[1][2] It is a Nature Conservation Review site, Grade I,[3] a Ramsar site[4] and a Special Area of Conservation.

[5] An area of 183.5 hectares (453 acres) is a national nature reserve[6] and an area of 150 hectares (370 acres) is a nature reserve called Pevensey Marshes which is managed by the Sussex Wildlife Trust.

[7] This is a large area of wetland grazing meadows intersected by a network of ditches.

It may be the best site in Britain for freshwater mollusc fauna, including the endangered shining ram's-horn snail.