The name, roughly translated from Irish as "cooking place of the deer" or sometimes "cooking pit of the wild men", refers to a type of site found in enormous numbers across Ireland, with tens of thousands recorded nationwide. The typical arrangement involves a horseshoe-shaped mound of heat-shattered stone, a hearth, and a trough, usually timber-lined and dug into the ground near a water source. Stones would be heated in the fire and then dropped into the water-filled trough to bring it to boiling point, after which meat could be cooked. The shattered, fire-cracked stones, discarded after use, are what built up into the distinctive mounds that survive today.

Fulachtaí fia are among the most common archaeological monuments in Ireland, yet individual examples like this one in Cashel remain quietly anonymous in the landscape, unenclosed and rarely marked. Most date to the Bronze Age, roughly between 1500 and 500 BC, though some sites were in use into the early medieval period. Mayo, with its boggy terrain and abundant watercourses, is particularly well supplied with them. The preservation of these sites in upland and marginal ground is largely accidental, a result of land that was never ploughed or heavily developed. That same marginal quality means many are encountered more by walkers crossing rough ground than by anyone seeking them out deliberately.