Cromarty Firth (krŏmˈərtē) [key], deep narrow inlet of Moray Firth, c.15 mi (25 km) long, Highland, N Scotland. It provides excellent anchorage, its narrow entrance being protected by the headlands of the Sutor rocks, more than 400 ft (122 m) high. The surrounding area has been developed for North Sea oil production.
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