It measures roughly ten metres across, ringed by a waterlogged fosse, which is essentially a ditch, between eight and ten metres wide and nearly a metre deep in places, with an outer bank of earth and stone beyond that. The whole arrangement stretches to an external diameter of around thirty-five metres, with a deliberate break in the bank on the south-south-east side. That gap, five metres wide, reads less like a collapse and more like an entrance; something, at some point, was meant to pass through it.

What makes the site stranger still is the company it keeps. Roughly thirty metres to the south-west lies a pond that appears to be associated with the wider complex, and thirty metres to the east there is a barrow, the kind of low burial mound that in Ireland typically dates to the Bronze Age, though the term covers a long span of prehistory. The clustering of a defined circular enclosure, a pond, and a funerary monument within such a compact area suggests this was not an accidental arrangement. Water sources in prehistoric Ireland were frequently treated as liminal, places where the boundary between the ordinary world and something else was thought to be thin. The shallow basin here, sitting at the very origin point of a westward-to-eastward flowing river, would have made it a natural focus for that kind of attention. The low hill to the east and the higher ground pushing in from County Wicklow to the north-west give the spot a quietly enclosed quality, sheltered without being hidden.