No earthwork, no ditch, no raised bank marks its outline today; the only reason anyone knows it is there at all is that the boundaries of 19th-century farm fields happened to follow its curve, preserving the ghost of a structure roughly 150 metres across in the pattern of hedges and fences recorded on the Ordnance Survey six-inch map of 1842.

That map, produced as part of Ireland's first systematic national survey, was detailed enough to capture not just roads and townlands but the precise angles of field boundaries that farmers had been maintaining for generations, sometimes without knowing why. In this case, the field fence pattern traced a large sub-circular enclosure, a shape characteristic of prehistoric or early medieval enclosures found across Ireland, which were typically defined by an earthen bank and internal ditch and used variously as farmsteads, assembly places, or ritual sites. At roughly 150 metres in diameter, this one falls at the larger end of the scale. Whether the original earthwork was deliberately levelled at some point or simply eroded away over centuries of cultivation and grazing is unknown, but nothing of it remains above ground.