Known locally as Lisin Dubh, the Black Fort, this small ringfort sits quietly in farmland, its outline legible in the ground even as agriculture has done its best to erase it.

Ringforts, sometimes called raths, are among the most common archaeological monuments in Ireland, typically dating from the early medieval period and serving as enclosed farmsteads for a single family or small community. They were formed by throwing up a bank of earth, often accompanied by an outer ditch, to create a protected enclosure for a dwelling and its associated livestock. Lisin Dubh is a more elaborate example than most: it originally had three concentric earthen banks with intervening ditches, or fosses, a arrangement that would have made it a relatively high-status enclosure. The two surviving outer banks stand roughly a metre high, with a fosse about half a metre deep between them; a third bank, somewhat lower, survives only on the western and northern arc. A causewayed entrance, essentially a raised crossing over the ditch, two metres wide, faces north. The name Lisin Dubh is recorded by Broker in 1937, suggesting the local memory of the site persisted well into the twentieth century even as the land changed around it. A large agricultural drain and field fence cutting east to west across the southern part of the site has levelled all three banks along that edge, leaving the northern and western sections as the clearest indication of what was once a carefully engineered enclosure.