Getting there
The A830 trunk road connects Mallaig with Fort William. At its highest point, 4km west of the village of Glenfinnan, there is a layby with a gate to the railway. There is space here for 4 or 5 cars.

Beinn Odhar Mhor
Through the gate, across the railway and around a fence, keep to the west of a burn and head south-west. The going underfoot can be a bit sodden at first as you cross over the rush and through occasional clumps of ferns. Turn west, keeping the burn on your left and follow a crest that rises and narrows. The crest gradually turns southwards as it climbs. Further up, the crags above Coire Odhar come into view - if you keep these well to your left (east), the terrain will be easier. Beinn Odhar Mhor is reached with its large cairn and broken trig-point.

Beinn Odhar Bheag
Even though Beinn Odhar Mhor has a large cairn, it's not a corbett - a bit more effort has to be put in ! From this summit aim south. The ground disappears as a sudden drop is reached - there is a gap just to the right. Follow the wide crest south, up over a bump, then south-west to the crags above dark Coire nan Clach. A faint path appears as the head of the coire is passed, then disappears on the last climb up Beinn Odhar Bheag. Beinn Odhar Bheag is one of those hills with several false summits, and the true summit only has a small cairn to distinguish it from the surrounding ground.

Beinn Mhic Cedidh
From Beinn Odhar Bheag's cairn, head north-west and start losing height. The route down over grass and occasional hidden boulders is obvious to the wide bealach. At the bealach, a fair, but easy slog up hill is directly ahead. This leads to the summit crest of Beinn Mhic Cedidh with its small pile of stones on the summit at the north-western end of the crest.

Return
You could head north from the summit, but this will leave you with a crossing of the Allt a'Choire Bhuidhe, which will be impossible to cross in spate until the railway is reached. Instead, from the summit, return to Bealach a'Choire Bhuidhe and on its easern bank, follow the Allt a'Choire Bhuidhe from 1km. At around c300m, contour around the hill and head for a waterfall and the top a track. A wooden bridge (not marked on OS Landranger) aids crossing above the waterfall, from where either head down the track to the railway, or preferably aim directly for your car in the lay-by. Both of these options will require some re-ascent !