This is a fulacht fia, a type of prehistoric cooking or processing site found in enormous numbers across Ireland, typically identified by a mound of heat-shattered, fire-blackened stone that accumulated over years of repeated use. The stones would be heated in a fire and dropped into a water-filled trough to bring it to the boil, cracking and darkening in the process until they were discarded in a spreading heap. What remains at Castlemary is precisely that residue, glimpsed where the plough has cut through it.

What makes this particular site quietly interesting is its company. Rather than standing alone, it belongs to a cluster of five fulachta fiadh recorded in close proximity to one another in this part of east Cork. The grouping suggests repeated, possibly sustained activity in the same landscape over time, whether for cooking, processing hides, or other purposes that archaeologists continue to debate. The burnt spread at this site was noted through personal communication from a local observer named P. Lyons, a reminder that many such features are first flagged not by formal excavation but by people who know a field and notice when the ground gives something away.