The reality, when someone finally went to look, was more ambiguous and considerably more recent.

Situated on a flat stretch of open karst, the exposed limestone pavement characteristic of the Burren region, the enclosure is a subrectangular drystone wall roughly 29 metres north to south and 22 metres east to west. Karst landscapes like this one tend to make ancient and modern construction look superficially similar; the same local stone, the same dry-laid technique, the same weathered grey surface. The site appeared in the Record of Monuments and Places in 1996 under the cautious designation of "enclosure", a holding category that acknowledges a structure without committing to an interpretation. Annotated maps from 1994 had been more confident, identifying it as a fort, but when the site was inspected in 1999 it was assessed as apparently modern construction. Whatever prompted someone to build a drystone enclosure of that size in that location, it was not the early medieval period.

The episode is a small illustration of how landscapes accumulate misreadings. A label on a map, passed from one source to another, can age into something that looks like evidence. The Burren is genuinely full of early enclosures and field systems, which makes the region both rewarding for survey work and prone to exactly this kind of confusion, where a relatively recent wall in the right setting briefly becomes something older than it is.