The River Tone rises in the Brendon Hills, and is dammed near its source to form the Clatworthy Reservoir. It flows roughly eastwards, through Taunton to join the River Parrett above Bridgwater. The River Exe rises on Exmoor in Somerset, about south of the Bristol Channel, but flows more or less directly south, so that most of its course lies in Devon and its mouth is on the south coast.