Loch Lochy is a large freshwater loch in Lochaber, Highland, Scotland.With a mean depth of 70 m (230 ft), it is the third-deepest loch of Scotland.
Located 16 km (10 mi) southwest of Loch Ness along the Great Glen, the loch is over 15 km (9 mi) long with an average width of about 1 km (5⁄8 mi).
The River Lochy flows from its southwestern end while the Caledonian Canal links its northeastern extent to Loch Oich.
