Firth

A firth is a long narrow arm of the sea in Scotland, which may be part of an estuary, or just an inlet, or even a strait (as in the case of the Pentland Firth.

A firth is very often associated with a large river, and erosion caused by the tidal effects of incoming sea water passing upriver, has widened the riverbed to an estuary. However, this cannot be said in every case. The Cromarty Firth on the East coast of Scotland]]. for example, could almost be likened to a large loch with only a relatively small outlet to the sea.

Further details to come.