The Isle of Grain (Old English Greon meaning gravel) is the easternmost point of the Hoo Peninsula in the district of Medway in Kent. No longer an island, the Isle is almost all marshland and the Grain marshes are a major habitat for diverse wetland birds. The Isle constitutes a civil parish, which at the 2011 census had a population of 1,648, a net decrease of 83 people in 10 years.