Somewhere on the open grassland of the Curragh, a slight swelling in the ground is easy enough to miss. It measures roughly seven and a half metres across at its base, rises no more than twenty centimetres at its highest point, and sits on a gentle south-facing slope, grass-covered and almost perfectly circular. It is, by most measures, barely there at all, and yet it was considered significant enough to record.

The Curragh itself is one of Ireland's more singular landscapes: a large expanse of unenclosed limestone grassland in Co. Kildare, grazed continuously for centuries and long associated with the military, horse racing, and an older, less easily categorised past. Low earthen mounds of this kind, subcircular and slightly domed, can sometimes indicate prehistoric activity, whether the remnant of a burial mound, a ring barrow, or simply a field feature whose original purpose has been worn smooth by time and weather. This particular mound was identified from aerial photography taken in 1999, which is often how such subtle features first come to formal attention; from the ground, without that overhead perspective, they can be nearly invisible to anyone not specifically looking.