It appears on the first edition of the Ordnance Survey six-inch map, recorded as a circular enclosure, the kind of earthwork that might once have been a ringfort or similar enclosed settlement. Today, no visible surface trace survives. The land has simply absorbed it.

Circular enclosures of this type were common features of the early medieval Irish landscape. A ringfort, typically a raised circular area enclosed by an earthen bank and ditch, served as a farmstead and place of security; thousands were built across Ireland between roughly the sixth and twelfth centuries. The one at Ballynaclogh measured about thirty metres in diameter and sat adjacent to a townland boundary, which is itself a detail worth pausing on. Townland boundaries in Ireland are ancient, often following the edges of older landholdings, and a settlement placed beside one suggests it may have played some role in defining or marking that boundary. When the first Ordnance Survey teams moved through Connacht in the nineteenth century, they mapped what they found, and whatever stood here at that time was visible enough to record. At some point between that survey and the present, ploughing, drainage, or gradual agricultural pressure erased what remained above the surface.