Loch Linnhe is a sea loch that follows the line of the Great Glen Fault and is the only sea loch along the fault.

About 50 kilometres (31 mi) long, the southern part of the loch is wider and its branch southeast of the island of Lismore is known as the Lynn of Lorne. Loch Eil feeds into Loch Linnhe at the latter's northernmost point, while from the east Loch Leven feeds in the loch just downstream of Corran and Loch Creran feeds into the Lynn of Lorne. The town of Fort William lies at the northeast end of the loch, at the mouth of the River Lochy.

The Corran Ferry crosses Loch Linnhe at the Corran Narrows visible in the mid-ground of this shot.