Plymouth Sound is a bay on the English Channel at Plymouth in England.
Map of the UK showing the location of Plymouth Sound at 50.343°N, 4.143°W (grid reference SX4751)50°20′35″N 4°08′35″W / 50.343°N 4.143°W
The Sound has three water entrances. The marine entrance is from the English Channel to the south. There is also the River Tamar and the River Plym.