Gibraltar Point, which sits at the northeast corner of the Wash estuary, was declared a nature reserve in 1949 and a National Nature Reserve in 1984.  Intertidal mudflats, salt marsh, freshwater marsh, ponds and lagoons form a rich mixture of habitats for the plants and animals protected within the 430 hectare reserve.

As well as breeding seabirds such as redshank, ringed plover and lapwing, over two hundred other bird species have been recorded here.  Other key species include the rare Natterjack toad which has established a small colony at Gibraltar Point following re-introduction in 1992.