The ring barrow at Mountfox is now detectable mainly from the air, where the buried outline of the monument appears as a cropmark, the kind of ghostly circular impression that shows up when differential moisture in the soil causes crops or grasses above a buried feature to grow at a slightly different rate to the surrounding land. It is the archaeological equivalent of an old scar, faint but legible if you know where to look.

A ring barrow is a burial mound of prehistoric origin, typically consisting of a central earthen mound enclosed by a circular ditch, or fosse, and an outer bank. The Mountfox example was still visible as a circular earthwork on the Ordnance Survey six-inch map edition of 1840, and by the time of the 1897 twenty-five-inch edition it was recorded as a roughly circular area approximately sixteen metres in diameter, defined by a scarp with a fosse and an outer bank. By that later survey, the southern edge had already been cut through by a drainage ditch running east to west, a common fate for low-lying monuments in agricultural land. Aerial orthophotography taken between 2005 and 2012 confirms it as a levelled monument, visible only as a cropmark, while Google Earth imagery reveals the full outline of the ring barrow, with an overall diameter of approximately thirty-two metres, sitting immediately to the north of that same drainage ditch. The site lies around 140 metres west of the townland boundary with Ballygubba North. The record was compiled by Martin Fitzpatrick and uploaded in May 2021.

There is little to see on the ground at Mountfox today. The monument lies in reclaimed pasture and the earthworks that were still legible to nineteenth-century surveyors have since been levelled by agricultural activity. Anyone with a serious interest in the site would do better to study the available aerial imagery before visiting, since the circular outline is far more apparent from above than from field level. The drainage ditch that truncated the southern arc of the barrow remains a useful locating feature. Access to private farmland in Ireland always requires the landowner's permission, and there is no infrastructure here for visitors. What this site offers, really, is a lesson in how much of the prehistoric landscape survives not in the ground itself, but in the information quietly held within it, waiting for the right angle of light or the right season's growth to make itself known again.