Fulachtaí fia are prehistoric cooking places, typically consisting of a horseshoe-shaped mound of heat-shattered stone surrounding a timber-lined trough. The method involved heating stones in a fire and dropping them into water in the trough until it boiled, a process efficient enough to cook a joint of meat in a couple of hours. The Kilgilky example covers a spread of roughly 12 metres by 14 metres and sits to the south-west of what is now a dried-up pond, that proximity to a former water source being entirely characteristic of the type.

What makes this particular location more than a single roadside curiosity is the density of monuments in the immediate area. A second fulacht fia lies a short distance to the east, and a third sits approximately 60 metres to the north-east. Whether these represent repeated use of a favoured watery landscape over generations, or something closer to organised, concurrent activity, is difficult to say with the evidence currently available. Fulachtaí fia are generally dated to the Bronze Age, roughly 2000 to 500 BC, though some sites have produced earlier or later dates. Their precise social function remains debated, with suggestions ranging from communal feasting to hide-working or even bathing, though cooking remains the most widely accepted interpretation. The clustering at Kilgilky, whatever its explanation, suggests this corner of North Cork was a place people returned to deliberately.