Ben Oss and Beinn Dubhchraig

This paired Munro walk is 11.5 miles (18.5 km) round trip from Dalrigh Car Park, climbing through Coille Coire-Chuilc to Beinn Dubhchraig before crossing the ridge to Ben Oss and returning the same way. Allow about 8 to 9 hours for roughly 1,230 m of ascent. It suits experienced hillwalkers looking for two summits and a long, varied ridge day; the approach alone is a substantial walk before either top comes into view.

Leave the car park by the lane, cross White Bridge, then turn onto the rough track beside the railway. A second bridge carries the track over the railway; beyond a gate, a path crosses open ground to a footbridge over Allt Gleann Auchreoch. From there the route heads upstream into Coille Coire-Chuilc, a remnant of the original Caledonian Forest. Pine gives way to birch and then open hillside, with several waterfalls along Allt Coire Dubhchraig and rocky pools in a small gorge.

The lower path is often sodden and boggy. It firms up higher beside the burn, but eventually fades before the broad ridge, where a clear line matters more than the distance suggests. Expect to move more slowly over the wet ground and the rough upper slope than along the first track miles.

From the ridge, follow the path southeast to Beinn Dubhchraig (978 m); the final climb along its broad back adds about 80 m. The summit opens south toward Loch Lomond and the surrounding hills. Retrace to the ridge junction, then turn southwest past small lochans and descend rockier ground to Bealach Buidhe above Loch Oss.

A tiny cairn marks where to leave the clearer path for a fainter line up a grassy slope to Ben Oss’s northeast top. From there, a better path follows the ridge to Ben Oss (1,029 m). The view west is dominated by Ben Lui; use it as the anchor in a summit photograph. On the return, retrace the ridge. Crags guard the north side of the bealach below Ben Oss, so do not try to descend that way. The walk climbs back toward the Dubhchraig ridge before dropping by the same burn and forest approach.