Plural of frith; multiple narrow inlets or arms of the sea.
Simple plural of frith, the Old Norse-derived word for coastal waterways. The regular English plural applies the -s ending to the Old Norse loanword.
Scotland is covered in friths and firths—Firth of Forth, Firth of Tay, Firth of Clyde—showing how Vikings literally mapped Scottish geography with Norse names that stuck for over a millennium!
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