The same ridge-and-furrow pattern continues outside the earthwork into the surrounding field, which suggests that cultivation here did not respect the boundary of the rath, either because the enclosure was already long-abandoned when the ridges were made, or because daily agricultural life simply carried on around and across it.

A rath is an earthen ringfort, typically dating from the early medieval period in Ireland, roughly the fifth to twelfth centuries, and constructed as an enclosed farmstead for a single family or small community. The example at Cloontarriff sits on a low hill amid pasture and bog, a position offering modest elevation and a view over Carrownamallaght, also marked as Rowans Lough on older Ordnance Survey maps, which lies just twenty-five metres to the south-west. A second small lake to the east has since dried up, leaving only boggy ground, and Cullentragh Lough sits roughly seven hundred metres to the south-east. The rath itself is sub-circular in plan, measuring about thirty metres across, and defined by a scarp between ninety centimetres and just over a metre high, which retains a low internal rim. The original entrance has not been firmly identified, though the point where the enclosing scarp dips lowest, on the east-south-east side, is the most likely candidate. A farm track runs along the north-east and eastern edges, leading away to a derelict farmstead to the north-west, a detail that quietly extends the site's story of habitation and eventual abandonment across several different eras.