On a gentle spur of land in County Waterford, a low circular mound sits so quietly in the grass that it could easily be mistaken for a natural rise in the ground. It measures somewhere between 7.5 and 8 metres across and rises only 20 to 40 centimetres at its highest point, yet it is encircled by a fosse, a deliberately cut ditch, and an outer bank that together give it a diameter of nearly 20 metres from edge to edge. There is no visible entrance anywhere around its circumference, which is itself a notable feature, suggesting the enclosure was never meant to be opened and re-entered in the way a simple burial pit might be.

This is a ring-barrow, a type of prehistoric funerary monument typically associated with the Bronze Age, in which the central mound, the surrounding ditch, and the outer earthen bank together formed a bounded, ritually separated space for the dead. The outer bank here stands between 50 centimetres and just over a metre high depending on which side you measure from, and the ditch between them is several metres wide at the top. The whole structure sits on a slight ridge oriented roughly southeast to northwest, with the headwaters of a small stream running about 170 metres to the southwest. That relationship between burial monuments and water sources is not uncommon in prehistoric landscapes, where streams and springs often carried symbolic as well as practical weight. A second ring-barrow lies approximately 70 metres to the southeast, which hints that this part of Castlereagh was once a meaningful place in the mortuary geography of its community rather than a solitary outlier in an empty field.