Ben Macdui (, meaning Mac Duff's Hill) is the second highest mountain in Scotland (and all of the British Isles) after Ben Nevis, and the highest in the Cairngorms National Park. The summit elevation is 1,309 meters (4,295 feet) AMSL. Ben Macdui lies on the southern edge of the Cairn Gorm plateau, on the boundary between the historic counties of Aberdeenshire and Banffshire (currently on the border between the Aberdeenshire and Moray council areas).