River Parrett
The River Parrett flows through the counties of Dorset and Somerset, from its source in the Thorney Mills springs in the hills around Chedington in Dorset. Flowing north-west through Somerset and the Somerset Levels to its mouth at Burnham-on-Sea, into the Bristol Channel, the Parrett and its tributaries drain an area of 660 square miles (1,700 km2) – about 50 per cent of Somerset's land area.