The Great Glen (Scottish Gaelic: An Gleann Mòr pronounced [an ˈkʲlaun̪ˠ ˈmoːɾ]), also known as Glen Albyn (from the Scottish Gaelic Gleann Albainn "Glen of Scotland") or Glen More (from the Scottish Gaelic An Gleann Mòr) is a long and straight glen in Scotland running for 62 miles (100 km) from Inverness on the edge of Moray Firth, to Fort William at the head of Loch Linnhe.
The Great Glen follows a large geological fault known as the Great Glen Fault. It bisects the Scottish Highlands into the Grampian Mountains to the southeast and the Northwest Highlands to the northwest.
The glen is a natural travelling route in the Highlands of Scotland, which is used by both the Caledonian Canal and the A82 road, which link the city of Inverness on the northeast coast with Fort William on the west coast. The Invergarry and Fort Augustus Railway was built in 1896 from the southern end of the glen to the southern end of Loch Ness, but was never extended to Inverness. The railway closed in 1947.