There is no objective measure of where the ends of the Lairig Ghru are. 'Gordon defines Lairig as a Hill Pass. In that case, the landscape is arguably too open for the ends of the Lairig's track to extend much beyond the imaginary lines drawn between the summits of Carn a' Mhaim and The Devil's Point at the southern end - and Carn Eilrig and Castle Hill at the northern end.