The south ridge includes the subsidiary summit of Stob nan Clach (956 m) which is listed as a top in Munro's Tables and is reached from the main summit by contouring round the head of Coire Cheathaich for a kilometre. A third ridge on the mountain goes north over the 895 metre subsidiary top of Meall Tionail (Hill of the Gathering) before dropping down to Glen Lyon. This north ridge can be used for access to or from Beinn Heasgarnich, as the ridge can be left after a short distance and Heasgarnich can be reached by going east over the boggy Bealach na Baintighearna (654 m). All rainfall on Creag Mhòr drains to the east coast of Scotland at the Firth of Tay, either via Glen Lyon or Glen Lochay.