The national park extends to cover much of the western part of the southern highlands, lying to the north of the Glasgow conurbation. The park authority defines the park as being split into four sections: Breadalbane, Loch Lomond, The Trossachs, and Cowal. The park is centred on Loch Lomond, the largest lake in Great Britain by surface area, with a surface area of . The loch contains many islands, including Inchmurrin, the largest fresh-water island in the British Isles. It is a popular leisure destination, and is surrounded by hills, including Ben Lomond on the eastern shore, which is in height, and the most southerly of the Scottish Munro peaks. A 2005 poll of Radio Times readers voted Loch Lomond as the sixth greatest natural wonder in Britain.