longest lake in Scotland, measuring 24 miles (39 km) from northeast to southwest, situated in Argyll and Bute council area, historic county of Argyllshire, at 117 feet (36 metres) above sea level. At the lake's northern end the scenery is rugged and grand, dominated by Ben Cruachan, with an elevation of 3,695 feet (1,126 metres), but at the southern end it is much softer. The loch's shores have been the scene of afforestation and hydroelectric power developments.