The Ordnance Survey's first mapping of this site at Gragan recorded it as square, an unusual shape for an early Irish enclosure. By the time the revised edition was published, the cartographers had redrawn it as circular. The monument itself had not changed, of course; what shifted was the interpretation, or possibly the legibility of a structure that was already, by then, badly deteriorated. That quiet discrepancy between two maps, separated by seventy-odd years, is one of the more curious things about a site that has otherwise slipped well beneath notice.

The structure is a cashel, a type of stone-walled ringfort associated broadly with the early medieval period in Ireland, roughly the fifth to twelfth centuries, though many were in use across longer spans. This one sits on elevated ground at Gragan in County Clare, measuring somewhere between thirty and thirty-one metres in diameter. What remains of the enclosing wall is now little more than a spread of stone, around two to two and a half metres wide and no more than sixty centimetres high for most of its circuit, though patches of the original outer facing still stand to as much as one point two metres at several points around the perimeter. The interior is largely flat, but stone foundations in the south-east and south-west corners suggest that structures once stood inside, their function now unclear. The cashel sits within a multiperiod field system, meaning the landscape around it carries traces of agricultural organisation from more than one era, layered across the ground in ways that are only partially legible today. The eastward view from the site is blocked by higher ground, giving the place an oddly enclosed quality despite its elevated position. Roughly twenty metres to the south, a second cashel occupies the same landscape, the two enclosures sitting in close proximity in a way that raises questions about whether they were contemporary, sequential, or related in some other way that the surviving remains cannot answer.