Lochnagar – Cac Carn Beag is a Munro of 1,155.7 m in Aberdeenshire. In the database's Braemar to Montrose region it is the highest of 21 register hills, above Carn a' Choire Bhoidheach and 19 others.
No register hill in Aberdeenshire has a greater drop, though Cairn Toul is higher. The key col lies 24.7 km away to the west, at 485 m. It is the most isolated register hill in Aberdeenshire: higher ground is 19.2 km away. It overtops all four of its nearest neighbours; the tallest of them, Carn a' Choire Bhoidheach, reaches 1,109.9 m. On the Munros height ladder it sits between Derry Cairngorm (1,155.8 m) and Sgurr na Lapaich (1,151.9 m). It is 226.6 m above the average height of the 28 register hills in Aberdeenshire. The summit is marked by a trig point.
