A firth is generally the result of ice age glaciation and is very often associated with a large river, where erosion caused by the tidal effects of incoming sea water passing upriver has widened the riverbed …

Synonyms of firth Relevance bay estuary loch See All Synonyms & Antonyms in Thesaurus

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

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

Feb 17, 2026 · Noun firth (plural firths) An arm or inlet of the sea; a river estuary. [from c. 1600]

A firth is a long, narrow area of sea or ocean that extends into the land, usually formed by glacial activity. It is essentially a type of inlet or estuary, often used to describe certain coastal features in …

Oct 23, 2025 · A firth is a narrow body of water that connects a larger body of water, such as a sea or ocean, to a river or estuary. Firths are often found in areas with high cliffs or mountains.

“Firth” entered Middle English through the Scots language, which took it from the Old Norse word “fjǫrthr.” This is also the root of “fjord,” a similar term, though a fjord is partly defined by its position in …

To the north, west and south, a flat coastal belt, bordering the Irish Sea, with its inlets Morecambe Bay and Solway Firth, and broadest in the north, marks off the Lake District, while to the east the valleys …

FIRTH definition: a long, narrow indentation of the seacoast. See examples of firth used in a sentence.