The area rises from lowlands in the north to the Pentland Hills in the southeast, while the southwest is moorland. Cairnpapple Hill is the highest peak at 312 m (1,024 ft), making it the lowest county top in Scotland. Two thirds of the land is agricultural, while a tenth is urban. Significant watercourses include the Almond and the Union Canal, while the main bodies of water are Linlithgow Loch, Dundas Loch, Humbie Reservoir, Lochcote Reservoir, Beecraigs Loch and Bangour Reservoir. The small island of Inchgarvie near the Forth Bridge lies within the historic borders of the county.