What survives at Moneen is the ghost of a circular enclosure, a feature type found across Ireland, typically associated with early medieval settlement or landholding, and usually defined by an earthen bank or wall enclosing a roughly circular area. Here, that enclosure measured approximately thirty metres across, and the early Ordnance Survey mapping captured it intact enough to trace the full ring.

By the time the first edition of the six-inch Ordnance Survey map was being drawn, the enclosure was already compromised, cut by a road at its north-east and south-east edges. That road did what roads often do to older earthworks, slicing through without ceremony and leaving the remaining arc to fend for itself. Today, only the south-western section holds on, a degraded and overgrown scarp rising to about one and a half metres. It sits on a south-facing slope in grassland, looking out over bog and marsh, the kind of terrain that would have made the slightly elevated ground of the enclosure practically useful as well as defensible or demarcated, depending on what purpose it originally served.

The loss of so much of the circuit makes interpretation difficult. Without excavation, there is little to say with confidence about its age, function, or the people who built it. What can be said is that the landscape around it, the wetland to the south, the gradual slope, the grassland holding the remnant scarp, still communicates something of why this particular spot might have mattered.