Loch Lomond /ˈloʊmənd/, (Scottish Gaelic Loch Laomainn) is a freshwater Scottish loch, lying on the Highland Boundary Fault. It is the largest loch/lake in Great Britain, by surface area, and contains many islands, including Inchmurrin, the largest fresh water island in the British Isles. 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). Its surface area measures 71 km2 (27 sq mi), and it has a volume of 2.6 km3 (0.62 cu mi). Of all lakes in Great Britain, it is the largest by surface area, and the second largest (after Loch Ness) by water volume. Within the United Kingdom (and indeed the entire British Isles), it is surpassed only by Lough Neagh in Northern Ireland.
Loch Lomond is now part of Loch Lomond and the Trossachs National Park. Ben Lomond is on the eastern shore: 974 m (3,195 ft) in height and the most southerly of the Scottish Munro peaks. A 2005 poll of Radio Times readers named Loch Lomond as the 6th greatest natural wonder in Britain. It is a popular leisure destination and is featured in song.