A clearance cairn is exactly what the name suggests: a pile of stones gathered and heaped by farmers who were clearing land for cultivation or grazing, removing rocks from the soil one season at a time over years or generations. These accumulations are easy to overlook, lacking the drama of a passage tomb or the obvious geometry of a ringfort, yet they carry their own quiet weight as direct evidence of human labour on a particular patch of ground.

Clearance cairns are found across Ireland wherever the underlying geology produces stony ground, and the west of Ireland, with its thin soils and limestone and granite bedrock, is particularly well supplied with them. They tend not to attract the same attention as ceremonial monuments, partly because they resist easy dating and partly because they were, by definition, practical rather than symbolic. That very ordinariness makes them interesting. The people who built them were not commemorating the dead or marking territory in any formal sense; they were simply trying to make the land workable, and the pile of stones they left behind is the residue of that effort. In parts of Connacht, such features can be medieval or early modern in date, though some may be considerably older, and without excavation it is rarely possible to say with confidence when a particular cairn was formed.