Beinn Dearg, Beinn Dearg Mhor and Sgurr Mhairi Loop

This is a compact but very demanding Red Cuillin circuit on the Isle of Skye, starting near Sligachan Hotel, Sligachan, Isle of Skye IV47 8SW, the best-known landmark and access point for the route. The loop links Beinn Dearg, Beinn Dearg Mhòr, and Sgùrr Mhairi/Glamaig’s south top over roughly 13 km / 8.1 miles with about 1,200 m / 3,940 ft of ascent, so although the mileage looks modest, the effort is not. Expect a long mountain day on steep, loose, often pathless terrain where progress can be slow, especially in mist, wind, or after rain. Walkhighlands user reports for this Sligachan Red Hills circuit put similar outings at around 13.2 km / 8.2 miles with 1,085 m / 3,560 ft of ascent, which fits well with your estimate and confirms the route’s serious character. (walkhighlands.co.uk)

The setting is one of the most distinctive mountain landscapes in Scotland. These hills belong to the Red Cuillin/Red Hills above Sligachan, a very different mountain group from the jagged Black Cuillin across Glen Sligachan. The Cuillin area is internationally known for its dramatic geology and much of it is protected as a Site of Special Scientific Interest, with parts also designated for important bird habitat including golden eagle. (visitscotland.com)

What the route feels like

From the Sligachan area, the opening section is usually the least glamorous part of the day: lower ground can be boggy, lines can be faint, and the correct turn-off is not always obvious if you are relying only on worn ground traces. One Walkhighlands report specifically notes a gate used to head toward Beinn Dearg Mhòr via Druim na Ruaige and describes the lower slopes as very boggy before the going improves with height. That is typical of these hills: soft approach terrain gives way to steep, gritty, reddish slopes and long runs of loose stone. (walkhighlands.co.uk)

Once on the rising ground, the character changes quickly. The Red Hills are built from granitic rock that tends to weather into scree and coarse gravel, so the climbing often feels like one step up, half a step back. Even strong hikers can find the ascents draining. The route’s “Difficult” rating is justified less by technical scrambling than by the combination of steep gradients, unstable footing, exposure to weather, and navigation demands. In clear conditions the ridges are exhilarating; in cloud they can become confusing because broad shoulders and multiple descending spurs make it easy to drift off line. For navigation, careful route planning on HiiKER is especially useful here. (walkhighlands.co.uk)

Climbing the summits

The first summit section toward Beinn Dearg and then Beinn Dearg Mhòr is where the route begins to open out into classic Skye panoramas. Beinn Dearg Mhòr itself rises to 731 m / 2,398 ft and is described by Walkhighlands as the middle summit of the Red Hills above Sligachan, with a fine cone-like top above extensive scree slopes. Views from this part of the loop stretch across to the Black Cuillin, over Glen Sligachan, and out toward the sea lochs and coastal settlements when visibility is good. (walkhighlands.co.uk)

The traverse onward toward Sgùrr Mhairi, the south top of Glamaig, is often the psychological crux. The ground between tops can look straightforward from a distance, but the descent and re-ascent involve loose material and steep angles that punish tired legs. Walkhighlands reports on the broader Glamaig/Beinn Dearg Mhòr circuit note descent planning via Bealach na Sgairde and mention deer tracks helping with line choice