Web Reference: Firth is a Scots (and English) word used mostly in Scotland to denote various forms of coastal waters, including bays. It's a cognate of fjord, a Norse word meaning a narrow inlet. Forth stems from the name of the river. This is *vo-rit-ia ('slow running') in Proto-Celtic, yielding Foirthe in Old Gaelic and Gweryd in Welsh. [3] Where does the River Forth become the Firth of Forth? Upon reaching Airth (on the river's south shore) and Kincardine (on its north shore), the river begins to widen and becomes the Firth of Forth. Middle English aforth, from Old English geforðian "to put forth, contribute; further, advance; carry out, accomplish," from ge- completive prefix (which in Middle English regularly reduces to a-; see a- (1)) + forðian "to further," from forð "forward, onward" (see forth).
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