[2] It was founded in 1961,[3] and is one of 46 wildlife trusts covering Great Britain and Northern Ireland.
[4] As of March 2017, it has 13,200 members, and it manages 3,120 hectares (7,700 acres) of land in 60 nature reserves, most of which are open to the public.
With an area of 1,466 square miles (3,800 km2), it is the eighth largest county in England,[6] and in mid-2016 the population was 745,000.
[8] Much of the coast consists of the estuaries of the Orwell, Stour, Alde, Deben and Blyth rivers, with large areas of wetlands and marshes.
[6] The whole or part of nine SWT reserves are Ramsar internationally important wetland sites, thirty-one are Sites of Special Scientific Interest, four are national nature reserves, ten are Special Protection Areas, ten are Special Areas of Conservation, seven are Nature Conservation Review sites, one contains a scheduled monument and three are local nature reserves.