Loch Lomond is a freshwater loch lying on the Highland Boundary Fault, often considered the boundary between the lowlands of Central Scotland and the Highlands.
It is 39 kilometres (24 mi) long and between 1.21 kilometres (0.75 mi) and 8 kilometres (5.0 mi) wide. It has an average depth of about 37 metres (121 ft), and a maximum depth of about 190 metres (620 ft). It's surface area is 71 km2 (27 sq mi), and it has a volume of 2.6 km3 (0.62 cu mi).
Of all lochs and lakes in Great Britain, it is the largest by surface area, and the second largest (after Loch Ness) by water volume.
Loch Lomond is one of Scotland's premier boating and watersports venues and the scenery draws people from all over Scotland and beyond. The loch is open to every kind of watercraft including kayaks, canoes, wind-surfers, jetskis, speedboats and cruisers and they are all very well represented.