No cartographer recorded it, no historical survey noted it, and to the naked eye walking the ground today there may be nothing obvious to see at all. The only reason anyone knows it is there is a cropmark, that is, a faint difference in how vegetation grows above buried or disturbed soil, which showed up in aerial photography taken by Ordnance Survey Ireland in 1995. That single set of images revealed the ghost of a roughly circular feature, approximately 25 metres in diameter, defined by what appears to be a fosse, a ditch dug around an enclosed area, most commonly associated with early settlement or territorial marking.

The enclosure occupies the top and centre of a west-north-west to east-south-east ridge running about 400 metres in length, a position that, in many periods of Irish prehistory and early history, carried practical and possibly symbolic weight. It sits within an alcove off a larger field to the north, and the same aerial imagery picked up a second cropmark: a field drain running roughly north-north-east to south-south-west away from the enclosure's northern edge. That drain may connect it to a broader field system in the area, one that appears regular in layout but has never been mapped, and is thought to be post-medieval in date. Whether the enclosure itself belongs to that later agricultural landscape, or whether it predates it and was simply absorbed into it, remains an open question. It was first reported by John Olney, and the relationship between the circular feature and its surrounding field pattern has not been formally resolved.