The highland boundary fault is a geological feature that divides Scotland’s lowlands from the Highlands. The fault line is the place where the rocks of the Highlands collided with those of the lowlands in a prehistoric world to create what we now see as Scotland.

The highland boundary fault runs north-east across Scotland passing just to the north of Alyth. To the north is the expanse of the Cairngorms and Grampian mountains and immediately to the south are the fertile lands of Strathmore. This fault line underlies the landscape of the Cateran Trail and determines the land use of the area both now and in the past.