The approximate southern boundary of the Cairngorm range is generally reckoned to run from slightly east of Braemar, west along the Dee and Glen Geldie to the head of Glen Feshie. The western edge of the range is defined by Glen Feshie and the River Spey as far as Aviemore, with the northern boundary running roughly eastward from Aviemore through Glenmore to Glen Avon. The eastern boundary is defined by Glen Avon and the Am Bealach Dearg, thus ending slightly east of Braemar.