Pagham Harbour is a 629-hectare (1,550-acre) biological and geological Site of Special Scientific Interest on the western outskirts of Bognor Regis in West Sussex. It is a Geological Conservation Review site, a Nature Conservation Review site, a Ramsar site, a Special Protection Area and a Marine Conservation Zone. An area of 599.1 hectares (1,480 acres) is a Local Nature Reserve. The harbour forms an area of saltmarsh and shallow lagoons. It is not an estuary, as no major streams enter the harbour with the only freshwater inflow a few small streams draining surrounding fields.