It has never been excavated, never been marked, and gives nothing away at ground level. The only way it announces itself is from the air, where differential crop growth traces out the ghost of a ring-ditch, a shallow circular trench whose fill retains enough moisture or nutrients to colour the crop above it a fractionally different shade than the surrounding soil.

Ring-ditches of this kind are generally understood to be the eroded remnants of prehistoric funerary or ceremonial monuments, often the last surviving trace of a round barrow whose earthen mound has long since been ploughed flat. The ditch, cut into the subsoil, resists tillage better than the mound it once surrounded, and so endures as a cropmark long after everything visible above ground has disappeared. What makes the Cooloughter example particularly interesting is its proximity to other archaeological features in the same townland. A burnt spread lies roughly ninety metres to the south-west, and a cluster of excavated features sits approximately one hundred and seventy metres to the north-west. Burnt spreads, sometimes called fulachta fiadh in the Irish tradition, are typically associated with the residue of burnt and water-cracked stone from cooking or industrial processes, and their recurrence near ring-ditches across Ireland suggests that prehistoric activity in any given area was rarely isolated to a single function or moment in time. Whether those nearby features at Cooloughter are directly connected to the ring-ditch remains unknown without excavation, but their clustering on the same slope points to a landscape that was used, and reused, over a considerable span of prehistoric time.