On the ground, there is nothing obvious to see; the site sits within a working field system, anonymous to anyone passing through. It was only when an aerial photograph taken in July 1989 captured a cropmark, that tell-tale ghostly arc, that the enclosure's presence was confirmed.

Cropmarks form when buried features such as ditches, or fosses as they are known in Irish archaeological terminology, cause differential growth in the crops or grasses above them. A fosse is essentially a defensive or boundary ditch, and where one has been cut into the subsoil and later filled in, the ground retains moisture differently from the surrounding undisturbed earth. In dry summers particularly, the variation becomes visible from above as a change in colour or height of the vegetation. The arc recorded at Renny runs roughly from the north-east around to the west, suggesting a circular or sub-circular enclosure of the kind commonly associated with early medieval settlement in Ireland, though the surviving evidence is too fragmentary to be certain of its original purpose or date. The site sits within a broader field system, meaning the landscape around it has been in agricultural use across many centuries, layering the modern and the ancient over one another.

Because the enclosure is known only from that single aerial photograph, there is little to guide a visitor on the ground. The fosse is not visible as an earthwork, and the site carries no marker or signage.