firth - a long narrow estuary (especially in Scotland)Scotland - one of the four countries that make up the United Kingdom of Great Britain and Northern Ireland; located on the northern part of the island of Great Britain; famous for bagpipes and plaids and kilts estuary - the wide part of a river where it nears the sea; fresh and salt water mix Firth of Clyde - a firth on the southwestern coast of Scotland emptying into the North Channel Firth of Forth - a large firth on the east coast of Scotland; location of Edinburgh Moray Firth - an inlet of the North Sea on the northeast coast of Scotland Solway Firth - a large firth on the west coast of Britain between England and Scotland |