Firth is a word in the English and Scots languages used to denote various coastal waters in the United Kingdom, predominantly within Scotland. In the Northern Isles, it more often refers to a smaller inlet.

Jan 8, 2026 · A firth is primarily a type of ria, which is a drowned river valley created when rising sea levels flood the lower portion of a river system. During the glacial periods, the immense weight of the …

The Economist, 4 Dec. 2019 Gray and harbor seals are a common sight in this firth, or estuary, where several major rivers meet the North Sea. National Geographic, 16 Feb. 2017

The attention devoted to the firth depends on operational factors and on what is needed elsewhere in the patrol area.

May 16, 2018 · The firth is named after Scotland’s largest river, River Tay, that discharges its waters into the Firth of Tay. Other firths found in Scotland include the Dornoch Firth, the Firth of Forth, the Firth …

Definition of firth noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

An oil tanker seized by the US in the North Atlantic last week has been spotted in Scotland's Moray Firth. The US has accused the Marinera of breaking its sanctions by carrying oil for Venezuela ...

Jun 24, 2025 · Noun firth (plural firths) An arm or inlet of the sea; a river estuary. [from c. 1600]

Definition A firth is an estuary or a narrow inlet of the sea, often characterized by its coastal geography.

Sep 21, 2025 · The term firth is closely related to a fjord, though it typically refers to those coastal inlets within Scotland or Northern Europe. Firths can be expansive or somewhat narrow, and they typically …