It is the footprint of a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically dating to the Bronze Age. The basic idea was straightforward: stones were heated in a fire, dropped into a trough of water to bring it to a boil, and used to cook meat. Over repeated use, the fire-cracked stones were discarded into a mound around the trough, and it is that characteristic spread of scorched, shattered rock and darkened earth that survives today, sometimes for thousands of years, in fields and bogs across the country.

The Agharinagh example is unassuming in scale but not entirely alone in its immediate landscape. A spread of dark-coloured soil has been recorded approximately 230 metres to the north-north-east, raising the possibility that prehistoric activity in this part of mid Cork was rather more concentrated than a single site might suggest. Whether the two features are contemporary, related in function, or simply coincidental neighbours, the ground between them quietly holds whatever answer there might be.