No earthwork rises above the ground, no stones mark the perimeter, and no signpost announces its presence. What survives is a cropmark, a phenomenon where buried features cause overlying crops or grass to grow at slightly different rates, producing patterns that become legible only from the air. Photographed in July 1989 as part of an aerial survey, the cropmark revealed the outlines of two concentric ditches, known as fosses, forming a roughly circular enclosure approximately 30 metres in diameter.

Circular enclosures of this kind are common across Ireland and are generally associated with the early medieval period, though some date earlier. They could serve as farmsteads, ceremonial spaces, or places of burial, and the presence of two concentric ditches suggests a degree of deliberate effort in the original construction. The inner fosse at Clogheen is partially obscured where a field boundary crosses the western edge of the site, a reminder of how agricultural activity over the centuries quietly erases, or at least complicates, the record left by earlier inhabitants. The enclosure itself measures only around 30 metres across, modest in scale, the sort of enclosed space that might once have sheltered a small household and its immediate surroundings.