Lochaber is a district of south-western Inverness-shire where the great lochs of the Great Glen bring their mouths to the sea. The district is bounded to the west by Loch Linnhe and Loch Lochy, loch of the Great Glen, to the north by the Corrieyairack range and adjoining hills, on the northeast and east by the district of Badenoch, to the southeast by the district of Rannoch and to the south at the sea by Loch Leven, the narrow sea loch which enters the sea a little south of Loch Linnhe and marks the boundary with Argyllshire. Argyll's lands also lie to the north of Loch Linnhe, where Morven hangs on the coast.
Lochaber measures 32 miles from the northeast to southwest and 25 miles from east to west, and is remarkable for wild and romantic scenery. Ben Nevis is the chief mountain, as it is the chief of all the mountains of the British Isles. Beneath Ben Nevis is the town of Fort William.
The district has given its name to a celebrated type of axe, consisting of a long shaft with a blade like a scythe and a large hook behind it, which, according to Sir Walter Scott, was introduced into the Highlands and Ireland from Scandinavia. It was the weapon of the old City Guard of Edinburgh.
The pathetic song of "Lochaber no more" was written by Allan Ramsay.