Lacht air Iorrais, near An Geata Mór, translates roughly from the Irish as a cairn or burial mound on Erris, pointing to a prehistoric funerary or commemorative monument of the kind that dots this wind-scoured landscape in considerable numbers. The Erris peninsula, one of the most remote and thinly populated stretches of the Irish coastline, has long been associated with ancient settlement and ritual activity, and a lacht, typically a cairn of stones raised over or near a burial, would not be out of place among its bogs and headlands.

Erris takes its name from the Irish Iorras Domhnann, a territory associated in early medieval sources with the Fir Domhnann, a people connected in old genealogies to the pre-Gaelic inhabitants of western Connacht. The landscape here was never densely farmed in the modern sense, and that neglect, if it can be called that, has preserved an unusual density of early monuments. A lacht, sometimes spelled leacht, is a modest cairn or heap of stones, often marking a grave or serving as a place of devotional cairn-adding by later travellers, a practice that continued well into the Christian period and blurred the line between pagan monument and folk piety. The specific history of this particular site at An Geata Mór remains formally undocumented in publicly available sources at present.