Where earthen ringforts, known as raths, were built from banked soil and timber, cashels were constructed from dry-stone walling, and their survival in the west of Ireland reflects both the abundance of local stone and the relative permanence of that building tradition. The word cashel itself derives from the Irish caiseal, sharing its root with place names scattered across Munster and Connacht wherever these circular enclosures once defined the boundaries of a family's land and livelihood.

Ringforts of this kind were not defensive structures in any military sense. They were farmsteads, the stone wall marking out a household's territory, protecting livestock from wolves and neighbouring disputes rather than armies. Inside, a family would have kept their animals at night, stored grain, and built their dwelling houses. Thousands of these enclosures survive across Ireland, yet each one represents a specific community rooted to a specific patch of ground, and the cashel at Caherpeak is one such remnant, its name combining the Irish caher, another word for a stone fort, with a local toponym that locates it precisely within this corner of Galway.