The one at Ballyhack, in County Wexford, exists only as a ghost in the soil. No bank breaks the surface here; instead, the site announces itself through cropmarks, the differential growth of crops or grass above buried archaeology that shows up clearly when photographed from the air. On a gentle north-facing slope, a circular outline roughly 55 metres in diameter becomes readable in aerial images, its perimeter defined by a narrow ditch and, at the eastern side, an inturned entrance, where the ditch curves inward to form a short corridor or passageway leading into the enclosed interior.

Ringforts, known in Irish as raths when earthen and cashels when built in stone, were the most common form of rural settlement in early medieval Ireland, typically dating from around the sixth to the tenth century. They functioned primarily as enclosed farmsteads, the ditch and bank serving less as military defences and more as a boundary to contain livestock and mark social territory. The inturned entrance at Ballyhack is a recognised feature of the type; by narrowing and directing the approach, it made the entrance easier to control and close off. That so little of this particular example survives above ground is not unusual. Centuries of ploughing can gradually erase earthwork features, leaving only the ditch fill, with its subtly different soil chemistry and moisture retention, to betray what once stood there.