A rath, as this type of monument is known, is a roughly circular enclosure defined by one or more raised earthen banks and accompanying ditches, built predominantly during the early medieval period, roughly between the fifth and twelfth centuries. These were the farmsteads of their era, the enclosed homesteads of farming families, and they are among the most common archaeological monument types in Ireland, with tens of thousands recorded across the country. That commonness, however, can obscure how genuinely strange it is to stand beside one: an unbroken domestic boundary from over a thousand years ago, still legible in the earth.

The townland name An Geata Mór, meaning "the big gate" in Irish, hints at a landscape that carried significance in the organisation of territory and movement, though the precise relationship between the placename and the ringfort is not recorded. Mayo contains a considerable density of such monuments, reflecting the county's long and layered history of settlement reaching back through the early medieval period and beyond. Ringforts in the west of Ireland were often sited with careful attention to drainage and visibility, and their banks would originally have supported a timber palisade or dense hedge, enclosing a household, its livestock, and its stores against both animal and human threat. The interior might have held a dwelling house, outbuildings, and a souterrain, an underground stone-lined passage used for storage or refuge.

Because detailed records for this particular site have not yet been made publicly available, specific dimensions, condition, or excavation history cannot be given here. What can be said is that the monument exists as a classified rath within a county where such earthworks remain a quiet but persistent feature of the rural landscape, occasionally visible as a raised circular platform in a field, or surviving as a slight depression where the banks have been reduced by centuries of ploughing.