What makes the site unusual is not simply its age but its arrangement: three ring barrows joined together, sharing their geometry in a way that is relatively uncommon in the Irish archaeological record. Ring barrows are prehistoric burial monuments, typically consisting of a low circular bank and an inner ditch enclosing a raised central mound, and the three here appear to form a single conjoined complex rather than three separate monuments that happened to accumulate over time.

The nature of the site was not formally confirmed until test excavation was carried out under licence number 06E0348, the results of which were reported by Lynch in 2006. Excavation along the east-west axis of one of the three features revealed a ditch running along the interior of its bank, which is precisely the structural detail that identifies a ring barrow as distinct from other circular earthwork types. The excavators concluded that this finding strongly suggests all three conjoined features belong to the same monument category. Each circular element measures roughly eleven metres in external diameter, with the external bank averaging about two and a half metres wide and standing approximately sixty centimetres high, and the internal fosse, the shallow ditch encircling each raised interior, running to around two metres wide and a quarter of a metre deep. Modest figures on paper, but enough to have survived millennia in a working agricultural field on the edge of a capital city.

The site lies in a paddock at Greenmount, adjacent to the railway line, which means access is on private land and should not be assumed without permission. The low profile of the banks means the monument reads best from above or in low winter light, when raking shadows throw the earthwork contours into relief. A Google Earth orthoimage captured in January 2017 gives a reasonable overhead impression of how the three rings sit together. There is nothing formally presented here, no signage or path, and the surrounding landscape offers no particular drama, which is precisely what makes it easy to overlook.