Cairns of this kind are among the oldest human constructions in Ireland, raised variously as burial monuments, territorial markers, or memorials to the dead, and they are scattered across the west of Ireland in numbers that can make each individual example feel unremarkable until you stop to consider what it represents: a deliberate act of building, often dating back four or five thousand years, carried out by people who had no metal tools and no written language.

The townland name itself carries interest. Imleach, from the Irish, generally refers to a place near a marsh or lakeside ridge, and the qualifier Beag Thuaidh, meaning small and northern, suggests it was once distinguished from a neighbouring townland of the same root name. Mayo's landscape of bog, drumlins, and Atlantic light has preserved a great many such monuments simply because the land was never intensively developed, and cairns that might have been cleared elsewhere have been left to moulder quietly into the hillside.