Beinn Dubhchraig is linked to the adjacent Munro of Ben Oss, which lies two kilometres to the west, by the Bealach Buidhe which has a height of 779 metres. The ridge down to the bealach is broad and holds a few small lochans within the schist rock hollows. There are corries to both the north and south of the bealach. Coire Garbh to the south holds Loch Oss, a sheet of water measuring roughly 500 metres by 300 metres with a small island located within it. To the north of the bealach is Coire Buidhe which has a very steep headwall which prevents a direct descent from the bealach down to the Cononish valley to the north. To the east, Beinn Dubhchraig falls to the valley of Gleann Auchreoch, much of these lower eastern slopes were planted with conifers in the early 1970s and have become an obstacle to approaches to the mountain from that direction.