Loch Morar is 18.8 kilometres (11.7 mi) long, has a surface area of 26.7 km2 (10.3 sq mi), and is the deepest freshwater body in theBritish Isles with a maximum depth of 310 m (1,017 ft).[1][2] In 1910, John Murray and Laurence Pullar found it to have a mean depth of 87 metres (284 ft) and a total volume of 2.3073 cubic kilometres (81,482,000,000 cu ft) during their survey of Scottish lochs.[3] The bottom is deepened below the United Kingdom Continental Shelf, and until 1943, when a depth of 324 metres (1,062 ft) was observed in the Inner Sound, it was believed to be the deepest water in the United Kingdom.[4][5] The surface of the loch is 9 metres (30 ft) above sea level