The enclosure, roughly thirty-five metres across, is defined by a fosse, a ditch cut into the earth, whose fill has compacted and aged differently from the surrounding soil. That subtle difference in moisture and density shapes how crops grow above it, producing a cropmark, a faint but legible ring that shows up on satellite imagery even as the field itself gives no outward sign of anything unusual.

The site was identified and reported by Jean-Charles Caillère, who spotted the circular anomaly on Apple Maps satellite imagery. Cropmark archaeology of this kind is a relatively modern discipline, relying on the fact that buried ditches retain moisture longer than undisturbed subsoil, causing the plants above them to grow taller or stay greener, particularly during dry spells. Circular enclosures of this type are broadly associated with early medieval Ireland, where they served as farmsteads, ritual sites, or high-status residences, though without excavation it is impossible to say what purpose this particular example served or when it was constructed. A field boundary running east to west immediately north of the enclosure is the only other feature noted, and it is unclear whether this boundary has any relationship to the older buried feature or simply reflects later agricultural organisation of the land.