The term, loosely translated from Irish, refers to a cooking site, typically a horseshoe-shaped mound of burnt and shattered stone accumulated beside a trough or pit filled with water. Meat, it is thought, was cooked by heating stones in a fire and dropping them into the water until it boiled. The site at Ballykerwick, Co. Cork, follows a pattern familiar to archaeologists: low-lying, wet ground, close to a water source. What makes it quietly notable is precisely how little of it survives to record.

When the site was first documented, it lay in marshy ground near a stream that appeared on a 1938 Ordnance Survey six-inch map to the north-east of the site. That stream was subsequently diverted, and its new channel cut directly through the monument. The tell-tale evidence of a fulacht fia, burnt and fire-cracked stone visible in the exposed section of the newly cut channel, confirmed what had been there. No mound remained above ground by the time of recording, meaning the mound of heat-shattered stone that typically defines these sites had already been dispersed or degraded. Then, in 1992, further drainage works completed what the first diversion had begun, and the site was recorded as destroyed.

The Ballykerwick fulacht fia is, in a sense, a monument to how quietly the prehistoric record disappears. Drainage schemes, which have transformed Irish farmland across the twentieth century, are among the most consistent agents of loss for low-lying archaeological sites. A site that might have preserved organic material, wooden troughs, animal bone, charred residues, and traces of Bronze Age activity, was undone not by a single dramatic event but by the incremental demands of agricultural improvement. What remains is a note in the record, burnt stone glimpsed in a channel wall, and the outline of a stream on an old map.