What remains at Coonmore is a fragment: a curving bank about twelve metres long and just over a metre wide, faced on both sides with a revetment of small boulders, the careful dry-stone facing still surviving in places to two courses. It is an easy thing to miss, and that is part of what makes it worth pausing over.

The site is classified as a cashel, a specific type of ringfort defined by its use of stone rather than earth alone as the primary enclosing material. Ringforts in general were the dominant settlement form in early medieval Ireland, typically serving as enclosed farmsteads for a family and their livestock, the surrounding bank or wall offering as much a statement of status as any practical defence. This one sits on the north-eastern edge of a slope, with higher ground rising to the west and north-west, a positioning that would have given its original occupants reasonable shelter and outlook. The northern arc of the enclosure, which would have completed the oval or circular plan, was lost to a road at some point after 1838, when the Ordnance Survey six-inch map recorded the site still largely intact. That map reference places the structure firmly in the documentary record, even as the ground itself was already, or soon to be, compromised by the road cutting through it. No entrance, external ditch, or internal features have been identified in what survives.