At Coolbunnia in County Waterford, an oval patch of stony ground sits on a south-to-north ridge, barely legible at ground level but clearly visible from the air as a circular feature. It takes ploughing to reveal it properly, at which point its dimensions become measurable: roughly 25 metres along its north-west to south-east axis and 15 metres across. Most of the time, it is simply part of a working field, its outline dissolved into the ordinary texture of farmed land.

What the site once was remains uncertain, but the finds recovered from it offer a partial picture. A piece of slag turned up in the area, suggesting some form of metalworking or industrial activity in the vicinity at some point. Alongside it came sherds of gravel-tempered ware, a type of coarse pottery commonly produced and used in Ireland during the 17th and 18th centuries, as well as later wares. Gravel-tempered pottery of this period tends to be associated with rural domestic contexts, farmsteads, and small enclosures that were in use or reoccupied during the post-medieval period. Whether the enclosure itself is medieval, earlier, or something else entirely, the finds suggest the ground here was active and in use across several generations at minimum.

The site was identified through vertical aerial photography, a method that has been quietly transformative in Irish archaeology, revealing crop marks, soil differences, and buried features that leave no surface trace whatsoever. In that sense, Coolbunnia is representative of a whole category of Irish sites: known to exist, imperfectly understood, and waiting somewhere beneath the field for a season of particularly good conditions or a more detailed investigation to say something more definitive about it.