Ben Cruachan, mountain in the Highlands, Argyll and Bute council area, Scot., culminating in several peaks, the highest of which is 3,689 feet (1,124 metres). It is situated between Loch (“Lake”) Etive on the north and Loch Awe on the south. The Cruachan hydroelectric scheme, at the northwestern end of Loch Awe—in which water from the loch is pumped 1,037 feet up to a high-level reservoir—was opened in 1965.