The one at Clooncannon, in County Galway, is typical in its outward form: a low, horseshoe-shaped mound, usually found close to a water source, built up over time from cracked and fire-shattered stone. What these structures were actually for has occupied archaeologists for generations.

The standard interpretation is that a fulacht fia functioned as an ancient cooking site. A trough, often timber-lined or cut into the earth, would be filled with water, and stones heated in a nearby fire would then be dropped in to bring the water to a boil. Repeated heating and rapid cooling causes stone to fracture, and the discarded fragments accumulated into the distinctive mounds that survive today. Most examples date to the Bronze Age, roughly 1500 to 500 BC, though some are earlier or later. The name itself is loosely translated as "cooking place of the deer" or "cooking place of the wild", though alternative theories, including use for bathing, textile processing, or brewing, have been debated at length in the archaeological literature. No single explanation has settled the matter entirely.

The Clooncannon example sits within a county that has no shortage of Bronze Age activity, and its presence in this part of Galway is a reminder that the landscape here was worked, settled, and understood long before any written record begins.