Creagdhu, Coire Odhar and Loch Long Loop

This 15 km / 9.3 mi loop with around 600 m / 1,970 ft of ascent is a solid medium-grade outing above the head of Loch Long, combining forest approach, open hillside, rougher upland ground, and broad views across one of the most dramatic corners of Loch Lomond and The Trossachs National Park. The route is best understood as a hill-and-loch circuit in the Ardgartan area, starting near Ardgartan Visitor Centre, Arrochar, Argyll and Bute, which is the nearest clear landmark and common access point for walks on this side of Loch Long. Ardgartan is a practical trailhead with parking, toilets, and direct access to signed paths and tracks. (walkhighlands.co.uk)

Expect a day that begins relatively gently and becomes more committing as you gain height. Lower down, the walking is usually on estate tracks, forest roads, or established paths, but higher sections around the corries and ridges can feel much wilder, with wetter ground, rough grass, heather, stones, and occasional boggy patches. A medium rating is fair: the distance is manageable for regular walkers, but the ascent, exposure to weather, and potentially indistinct sections mean it still needs proper hill preparation. HiiKER is the best tool to carry for route-following on a walk like this, especially if mist drops over the higher ground. (walkhighlands.co.uk)

What the route feels like

From the Ardgartan side, the first part of the day is often the easiest underfoot, with a steady build through woodland and on rising tracks before the route opens out. Loch Long quickly becomes a constant visual companion, and as height is gained the views widen toward the Arrochar Alps and the long sea loch stretching south toward the Firth of Clyde. Walks beginning here commonly use the signed network around Ardgartan and connect into longer hill routes via the Cowal Way and adjacent upland paths. (walkhighlands.co.uk)

The middle part of the loop is where the character changes. Around Coire Odhar, the terrain becomes more open and more obviously glacial in shape, with steep-sided hollows, drainage lines, and rougher mountain ground. Scientific work on the Glen Croe and Loch Long area notes the strong glacial and post-glacial shaping of these valleys, and that helps explain the dramatic corries, hanging slopes, and unstable-looking scarps that give the landscape its rugged feel. (nora.nerc.ac.uk)

If your loop includes Creag Dhubh as the main high point or shoulder, expect the ascent to become steeper and more sustained for a time. “Creag Dhubh” translates roughly as “black crag,” and in Scotland that name usually signals darker rock, steeper ground, or a craggier profile. On this kind of route, the reward is not just the summit itself but the changing perspective: forest and loch below, corries to one side, and the larger Arrochar skyline beyond. (mapcarta.com)

Landmarks, scenery, and natural features

The standout landmark is Loch Long itself, a long sea loch cutting deep into the Southern Highlands. From higher ground above Ardgartan, it gives the walk much of its sense of scale, with shifting light on the water and long views up and down the loch in clear weather. The surrounding hills rise sharply from near sea level, which makes even moderate summits feel surprisingly lofty. (walkhighlands.co.uk)

Coire Odhar is another key feature. The Gaelic name means something close to “dun-coloured corrie” or “brown corrie,” which suits the muted tones of bracken, peat, grass, and heather often seen here outside the brightest summer weeks. This section is likely to feel quieter and more remote than the lower approach, and after rain it can be wet underfoot.