A firth 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 to an estuary, such as may be seen in the Firth of Clyde. However, this cannot be said in every case. The Cromarty Firth on the East coast of Scotland. for example, resembles a large loch with only a relatively small outlet to the sea.
See Pentland Firth.
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