Firth
Firth, a Scottish term applied to some coastal waters, especially estuaries. Notable firths include the Firth of Clyde and the Firth of Forth. The term is also used for straits, such as Pentland Firth.

Firth, a Scottish term applied to some coastal waters, especially estuaries. Notable firths include the Firth of Clyde and the Firth of Forth. The term is also used for straits, such as Pentland Firth.