Great Glen or Glen More, valley, 60 mi (97 km) long, Highland, N central Scotland, extending from Moray Firth SW to Loch Linnhe. It was formed by a fault in the earth's surface. Loch Ness, Loch Oich, and Loch Lochy, glacial lakes located on the fault line, extend hundreds of feet below sea level. The Caledonian Canal traverses Great Glen.
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