The Cairnwell Pass (Scottish Gaelic: Càrn a' Bhailg) is a mountain pass on the A93 road between Glen Shee, Perthshire, and Braemar, Aberdeenshire, in the Scottish Highlands. The border between the two counties crosses the summit of the pass. With a summit altitude of 670 m (2199 ft), the Cairnwell Pass is the highest main road in the United Kingdom, and at the summit is the Glenshee Ski Centre, Scotland's largest and oldest ski centre. Historically, the pass was a drover's route from the Lowlands to the Highlands. The road is often blocked by snow in the winter.