A circular enclosure roughly 40 metres in diameter, apparently defined by a fosse, a defensive or boundary ditch, shows up on the Ordnance Survey six-inch map as a hachured ring, those fine radiating lines cartographers use to indicate earthwork features. On the ground itself, however, nothing is visible. The enclosure has either been ploughed out, grown over, or simply settled back into the hillside over the centuries to the point where there is no surface trace remaining.

What makes the site quietly compelling is its relationship to the landscape around it. It sits 25 metres south of a second enclosure, suggesting that whoever occupied or used this part of Moneymore was not alone here. Paired or clustered enclosures of this kind are known elsewhere in Ireland, and while their precise function varies, they are generally associated with early settlement, livestock management, or territorial marking in the early medieval period. The fosse that apparently defines this example points toward a deliberate boundary, a way of separating an interior space from the world outside, even if whatever stood within that space has long since disappeared. Without excavation, the dating and purpose of the enclosure remain open questions, and the site exists now mainly as a cartographic ghost, legible only to those who know how to read the old maps.