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Firth of Forth
The Firth of Forth, near Edinburgh
"Firsth" is a term used primarily in Scotland to describe usually a long narrow estuary, often a fjord, and sometimes a strait. The best known are those of the Forth, Tay, and Clyde; the Solway Firth, into which several rivers drain; the Moray Firth, between the northeast tip of Loch Ness and the North Sea; and the Pentland Firth, the strait between northeast Scotland and the Orkney Islands.

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