mountains in the Highlands of Scotland. They derive their name from the Mons Graupius of the Roman historian Tacitus, the undetermined site of the battle in which the Roman general Agricola defeated the indigenous Picts (c. AD 84). The name usually refers to the entire mass of the central Highlands between Glen Mor and the wall-like southern edge that overlooks the Lowlands. More strictly it refers only to the latter striking relief feature. Summits exceed 3,000 feet (900 metres), and the highest peaks are Ben Nevis, with an elevation of 4,406 feet (1,343 metres), and Ben Macdui, with an elevation of 4,296 (1,309 metres) in the Cairngorm Mountains.