Carn Mor Dearg is situated close to the town of Fort William in Lochaber, Highland Scotland. At a height of 1,223 m (4,012 ft), it is the 8th highest mountain in Scotland, but is overshadowed in its own landscape by the higher and more famous Ben Nevis.
The Carn Mor Dearg arête links the two, which are usually ascended together. Carn Mor Dearg itself has steep rocky sides, often craggy, on its east and west slopes. The usual ascent begins on the route up Meall an t-Suidhe, a lower hill to the west, or via the route by the Allt a' Mhuillinn, following the ridge around the rim of the basin below until reaching the arête and onwardaround Coire Leis to connect with Ben Nevis’ southern shoulder. This approach and Carn Mor Dearg’s summit gives superb view of the north face of its more famous neighbour.