The one on Clomantagh hill in County Kilkenny does something different. It sits on a south-facing slope at considerable altitude, settled into a large natural hollow just below the crest of the hill, where the land itself provides shelter to the north and west while leaving a wide opening to the south. From inside this hollow, the views stretch far to the south and southwest; from the rim, they open in every direction. It is an unusual setting for what appears to be a domestic enclosure.

A ringfort, sometimes called a rath, is typically a circular area of ground enclosed by one or more earthen banks and ditches, and was the most common form of rural settlement in early medieval Ireland. The example at Clomantagh was not identified on the ground but from the air, spotted as a circular enclosure on an aerial photograph taken between 1973 and 1977. What the photograph revealed is a level circular area of up to thirty metres in diameter, enclosed by an earthen bank roughly two metres wide, with both internal and external faces rising about thirty centimetres. The altitude might seem to argue against settlement, but the notes suggest it need not: before the surrounding forestry was planted, this hillslope would have offered rough upland grazing, which is reason enough for someone to have established a presence here. The classification remains tentative, which is itself part of what makes the site interesting; it sits at the edge of what the surviving evidence can confirm.