Portal tombs, sometimes called dolmens, are Neolithic monuments typically consisting of two tall upright stones forming an entrance portal, a lower backstone, and a large capstone tilted dramatically overhead. They were built by farming communities in Ireland roughly five to six thousand years ago, and while their exact ritual function is debated, most are understood to have served as places of communal burial and perhaps ongoing ceremonial use by the living.

Mayo is not short of prehistoric monuments, but portal tombs are among the more visually arresting, and the county's landscape, shaped by glacial movement and ancient human settlement, preserves a number of these structures in varying states of survival. The Enagh Beg example belongs to this broader pattern of Neolithic activity across the west of Ireland, where communities cleared land, raised livestock, and marked the landscape with lasting stone architecture. Beyond its classification and location, detailed information about this particular monument remains sparse in the publicly available record.