Beinn Mhor is a Graham of 620.5 m in Na h-Eileanan Siar [Western Isles]. Its key col is at sea level, so all 620.5 m of its height counts as drop.
Nothing higher stands within 63.2 km; the nearest higher summit is Sgurr Thuilm (880.1 m), to the east. Its drop is the 7th greatest among the Grahams, behind Sgurr na Coinnich at the top. In the database's North Uist, South Uist and Nearby Islands region it is the highest of two register hills, above Heacla. Only 28 of the 737 hills profiled in Scotland are lower. On the Grahams height ladder it sits between Creag Ghuanach (620.7 m) and Beinn Bheag (Argyll and Bute) (619.8 m). The summit is marked by a trig point.
