Broad Law is the second highest hill in the wide expanse of hill country in Southern Scotland, the Southern Uplands. It has an elevation of 840 metres, a prominence of 653 metres (and thus is a "major") and an isolation of 80 kilometres. It is only ten feet lower than its parent, Merrick. Like many of its neighbours it is smooth, rounded and grassy, although the surrounding valleys have very steep sides — country somewhat akin to the Cheviots or the Howgill Fells. The hill may be climbed from any of the villages near its base, or as part of a long, 30-mile trek across the local area between the towns of Peebles and Moffat. There is a radio tower and a VOR beacon on the summit, one of the highest sites in Britain.