On the western slope of Coumaraglinmountain in County Waterford, there is a circular mound so low and so thoroughly grassed over that a walker might cross it without a second glance. It measures between four and four and a half metres in diameter and rises only twenty to thirty centimetres above the surrounding ground. What lifts it out of the ordinary is the ring of kerbstones at its edge, stones that define the cairn's circumference but barely break the surface, sitting flush with the turf as though the whole structure is slowly easing itself back into the hillside.

A cairn circle of this kind is a prehistoric monument type in which a mound of stones, usually covering a burial deposit, is enclosed or edged by a kerb of upright or laid stones arranged in a ring. They are found across Ireland and Britain in various forms, and while many examples are substantial enough to dominate a landscape, this one on Coumaraglinmountain is a quieter, more self-effacing specimen. Its position is particular: it sits between the Araglin River running northeast to southwest roughly thirty metres to the northwest, and an unnamed tributary to the south. That placement, on gently sloping ground between two watercourses on an open hillside, would have been a deliberate choice, though what it meant to the people who built it is not recoverable from what survives.