 Beinn Achaladair is a distinct landmark for both road and rail travellers with both the A82 road and the West Highland Line passing close to the foot of the mountain with the railway actually traversing the lower northern slopes before crossing Rannoch Moor on its way to Fort William.The mountain looks impressive from the north west throwing down steep wall like slopes and along with the three adjoining Munros of Beinn Dorain, Beinn an Dothaidh, and Beinn a' Chreachain it forms the historical Great Wall of Rannoch, which was the boundary between the old Pictish Kingdom to the east and the Dál Riata kingdom of the Scots in the west.Beinn Achaladair reaches a height of and is classed as a Munro and a Marilyn, geographically it is part of the southern highlands but it stands at their northern extremity and displays many of the characteristics of the rockier peaks to the north.