The highest of the Drumochter mountains in highland Perth and Kinross Council Area, Beinn Udlamain lies to the east of Loch Ericht. Its plateau summit reaches 1011m (3317 feet) and the ridge to the summit consists of a line of fence posts which marked the boundary between the old counties of Perthshire and Invernessshire. Its name is derived from the Gaelic for"gloomy mountain".