Langstone Harbour is a 2,085.4-hectare (5,153-acre) biological Site of Special Scientific Interest in Hampshire. It is an inlet of the English Channel in Hampshire, sandwiched between Portsea Island to the south and west, Hayling Island to the south and east, and Langstone to the north. It is part of Chichester and Langstone Harbours Ramsar site, Special Protection Area and Nature Conservation Review site, Grade I. Parts of it are in Solent Maritime and Solent and Isle of Wight Lagoons Special Areas of Conservation. Three areas are Local Nature Reserves, Farlington Marshes West Hayling and The Kench, Hayling Island. Two areas are nature reserves managed by the Hampshire and Isle of Wight Wildlife Trust, Farlington Marshes and Southmoor Nature Reserve