This is a fulacht fia, a type of prehistoric cooking place typically identified by its spread of fire-cracked stone and charcoal, the debris of repeated heating. The basic method involved heating stones in a fire, then dropping them into a water-filled trough to bring it to a boil, a process that gradually produced the characteristic mound of blackened, fragmented material visible today.

The spread at Corrin measures approximately eight metres in diameter and sits on the southern side of a stream, the stream itself now surviving only as a shallow linear depression cutting across the field. That detail matters: fulachtaí fia are almost invariably found close to water, since a reliable source was essential to the whole operation. What makes this site particularly interesting is that it is not alone. A second, closely comparable spread lies roughly twenty-five metres to the north-east, on the opposite bank of the same stream. The two sites facing each other across what was once flowing water raises quiet questions about whether they were used simultaneously, sequentially, or by different groups returning to a productive location over time. The pairing is noted but not explained, which is often the most honest position archaeology can offer.