Map & Elevation
About this Route
This is a long out-and-back from Sligachan to Marsco, following the main Glen Sligachan path before turning east beside the Allt na Measarroch. The replacement GPX measures 15.4 km, gains 979 m and gives a walking-time estimate of 4 hours 42 minutes. Published descriptions are usually closer to six or seven hours, which is a better allowance for the boggy ground, steep climb and careful descent.
The first three kilometres are relatively easy walking on the Loch Coruisk path. Leave it at the Allt na Measarroch and follow the burn across rough, often wet ground towards Màm a' Phobuill, the bealach between Marsco and Beinn Dearg Mheadhonach. The path is much less obvious here, so this is where the GPX and a proper map earn their keep.
From the bealach, old fence posts help with the line up the broad ridge. The climb soon steepens and can be unpleasantly slippery after rain. Higher up, the angle eases before the ridge narrows on the way to Marsco's 736 m summit. The top is small, with steep slopes falling away on both sides, and it is a poor place to be in strong wind or thick mist.
Return by the same route, taking particular care on the steep grass above Màm a' Phobuill. Once back beside the Allt na Measarroch, regain the main Glen Sligachan path for the easier walk out. There are several burns on the approach and they can become awkward after heavy rain. Carry food, waterproofs and an independent navigation backup, and save this route for a reasonably clear, settled day.
Taking the ridge, views and underfoot conditions into account, not one for a wet, windy or foggy day.
Scotland Off the Beaten Track
Route Waypoints
Start near the old bridge and take the signed Loch Coruisk path south into Glen Sligachan, keeping the river on your right.
Continue on the clear, stony glen path. Ignore smaller lines towards the Red Cuillin and keep heading south.
Leave the Loch Coruisk path at the burn and turn east. The ground becomes boggier and the line much less distinct from here.
Follow the Allt na Measarroch upstream, choosing safe crossings where its branches spread. Water levels can change quickly after rain.
Reach the bealach between Marsco and Beinn Dearg Mheadhonach. Turn south onto Marsco's ridge rather than continuing into Coire Dubh Measarroch.
Use the old fence posts as a rough guide up the steep, grassy ridge. The slope is tiring and particularly slippery when wet.
The final ridge narrows before the small 736 m summit. Avoid the edge in wind or mist and return by the same ridge.
Descend carefully to Màm a' Phobuill, follow the burn back to Glen Sligachan and turn north on the main path to the parking area.
Essential Tips
The GPX estimate is optimistic for this ground. Six to seven hours is a more useful plan once bog, burn crossings and the steep descent are included.
Marsco's upper ridge is narrow and exposed. Strong wind, low cloud or wet grass can turn the final climb into a poor proposition.
Several watercourses cross the approach. If the Allt na Measarroch is high on the way in, remember that it may rise further before your return.
Go back over Màm a' Phobuill and retrace the approach. Do not improvise a descent into the craggy ground north-west of the summit.
Frequently Asked Questions
Is Marsco suitable for beginners?
No, this is a severe-grade route. You'll deal with boggy pathless sections, steep slippery grass, and a narrow exposed summit ridge that's genuinely dangerous in poor weather.
What happens if the burns are high when I'm hiking Marsco?
If the Allt na Measarroch is already running high on your way in, it could be even worse on your return—and you have to cross it to get back. Several watercourses can become awkward or impassable after heavy rain, so save this walk for settled weather.
Where does the path to Marsco start?
Start at Sligachan riverside parking near the old bridge. You'll follow the signed Loch Coruisk path for the first 3.2 km before leaving it at the Allt na Measarroch burn and heading east.