This is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically dating to the Bronze Age. The characteristic mound, which gives many of these sites their distinctive horseshoe or kidney shape, is formed from the accumulated debris of a simple but effective process: stones were heated in a fire, then dropped into a water-filled trough to bring it rapidly to the boil, cracking and blackening in the process until they were useless and discarded. Over repeated use, the broken material piled up into exactly the kind of spread visible here.

The site lies within the grounds of Castlebernard, a Cork demesne whose landscaped character is still suggested by the ornamental lake lying just to the west. That proximity is a small reminder of how layered these estates tend to be, with the organised aesthetics of eighteenth or nineteenth-century improvement sitting directly alongside features that predate written history by millennia. The fulacht fia would have been in use long before any formal shaping of this land took place, its location likely chosen for access to water, a resource as necessary for prehistoric cooking as it was later for the making of a gentleman's ornamental lake.