The feature measures roughly 55 metres in diameter and is defined by a fosse, a ditch cut into the earth that would originally have marked a boundary of some significance, whether defensive, agricultural, or ceremonial. What makes it quietly odd is its incompleteness: only the northern, eastern, and southern arcs of the fosse show up on aerial imagery, while the western side has been obliterated by a later north-south field bank that cuts straight across the circle, erasing whatever once lay there.

The enclosure was first reported by Jean Charles Caillére, and its existence was otherwise unrecorded before that. Circular enclosures of this kind are a familiar, if not always well-understood, feature of the Irish landscape. They range from the ringforts of the early medieval period, which served as enclosed farmsteads, to earlier prehistoric boundaries whose purposes remain harder to pin down. Without excavation, the Cooladine example cannot be securely dated, and the partial survival of its fosse means that much of the picture remains incomplete. The field bank that truncates it is itself a reminder of how agricultural reorganisation across centuries can quietly overwrite earlier land use, leaving only fragments for later eyes to piece together.