What they would be skirting is the remains of a rath, an early medieval earthen ringfort, whose enclosing bank has been folded so thoroughly into the surrounding field boundary that the two are now effectively one. The interior diameter of the raised area measures 31.7 metres, which gives some sense of what was once a reasonably substantial enclosure, likely the fortified homestead of a farming family of some local standing in early historic Ireland.

Ringforts of this kind were typically built between roughly the sixth and tenth centuries, serving as defended farmsteads rather than military strongholds. At Ardmone, the earthen bank that once defined the enclosure has been substantially modified over the centuries, its material spread and reshaped to serve the more prosaic needs of agricultural field division. The site was recorded as 'Fort' on Ordnance Survey maps of both 1836 and 1876, which suggests that even as its physical integrity was being eroded, local cartographers and inhabitants still recognised it as something distinct from the ordinary landscape. The original entrance to the enclosure is thought to have faced west, a detail that endures in the archaeology even as the structure itself has been largely absorbed into the working farmland around it.

The site is not a managed or signposted location, and its most striking quality is precisely how thoroughly it has been assimilated into the field system. What remains visible is a subtle rise in the ground and the incorporated bank along the field edge, details that reward a careful eye rather than a casual glance.