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This freshwater loch is 24 miles long (39 kilometres), and ¾ mile to 5 miles wide. It has an average depth of about 120 ft (37 metres), and a maximum depth of about 630 ft (190 metres). Its surface area measures 27¼ miles² (71 km²), and it has a volume of 0.6 cubic miles (2.6 km³). It has the largest surface area of all the lochs, and is second biggest after Loch Ness in terms of water volume in Great Britain