Known as a cashel, this is a ringfort defined by stone rather than earth, a form of enclosed settlement common across early medieval Ireland, typically associated with a single farming family or minor lord. The wall here, around 36 metres across on its north-south axis, still stands to roughly half a metre on the interior and slightly more on the outside. A break in the wall to the south suggests the original entrance, and the interior itself has been carefully managed against the slope, with the southern half graded upward so that the living surface remained reasonably level. That southern half is now thick with sloe bushes.

What makes the site particularly interesting is its relationship with the water below. A crannog sits in Lough Allua nearby, and a crannog is an artificial or partially artificial island, constructed in a lake or wetland and used as a defensible dwelling place, again most commonly in the early medieval period. In 1909, a local observer named Lunham recorded what he described as a passage raised above the level of the lake bed connecting the crannog to the cashel on the hillside above. The idea of an elevated causeway linking island settlement to hilltop enclosure, both overlooking the same stretch of water, suggests a degree of planned relationship between the two sites that goes well beyond coincidence. Whether that connection was practical, social, or defensive, probably all three at once, it points to a landscape that was once organised and inhabited in ways that the present-day pasture gives little hint of.