The North Kent Marshes, located in the north of the county of Kent on the Thames Estuary in south-east England, is one of 22 Environmentally Sensitive Areas recognised by the UK government's Department for Environment, Food and Rural Affairs (DEFRA). It lies within the Thames Gateway regional planning area. The North Kent Marsh with its stable water level is an important habitat for the water vole. There are thirteen key sites throughout Britain. Shorne and Higham marshes, with parts of Cliffe and Cooling marsh, Allhallows and Grain marshes and the Isle of Sheppey are among them.