It would be easy to walk past it, dismissing it as a natural irregularity in the boggy ground. But the ditch cut through it tells a different story: in the exposed section, layers of burnt material are clearly visible, the telltale signature of a fulacht fia.

A fulacht fia is a type of prehistoric cooking or industrial site found in enormous numbers across Ireland, particularly in low-lying, wet ground. The typical arrangement involves a trough dug into the earth, a nearby hearth for heating stones, and a mound formed over time from the discarded burnt and shattered stones that accumulated after repeated use. Water would be brought to the boil by dropping fire-heated stones into the trough, and the cracked, blackened stones were then piled to the side. It is this characteristic dark, fire-cracked debris that makes sites like Lisheen identifiable even when the mound itself has been reduced almost to nothing. The Cork example sits precisely where such features tend to appear, at the wet margin of a slope where water collects naturally, the kind of spot that would have provided a reliable water source for whoever used it, likely during the Bronze Age.