Cairn Toul is the 4th-highest mountain in Scotland and all of the British Isles, after Ben Nevis, Ben Macdui and Braeriach. The summit is 1,291 metres above sea level. It is in the western massif of the Cairngorms, linked by a bealach at about 1125 m to Braeriach. The mountain towers above the Lairig Ghru pass.