The Grampian Mountains or Grampians (Am Monadh in Gaelic) are one of the three major mountain ranges in Scotland, occupying a considerable portion of the Scottish Highlands in northeast Scotland. The range extends southwest to northeast between the Highland Boundary Fault and Gleann Mòr (the Great Glen), occupying almost half of the land-area of Scotland and including the Cairngorms and the Lochaber hills.