Wraysbury is a village and civil parish on the east (left) bank of the River Thames, about midway between Windsor and Staines, and 18 miles (29 km) west by south-west of London. Until 1974 it was in the county of Buckinghamshire. It was administered by Berkshire County Council between 1974 and 1998, and now by the Royal Borough of Windsor and Maidenhead; however the Wraysbury Reservoir is in the Spelthorne district of Surrey.