These low, horseshoe-shaped mounds, typically found near water sources, are the remains of ancient cooking sites, though some researchers have proposed they also served as brewing vessels, sweat lodges, or even textile-dyeing facilities. The method was straightforward: stones were heated in a fire, then dropped into a water-filled trough to bring it to a boil. Repeated heating and cooling eventually caused the stones to crack and shatter, and the discarded fragments accumulated into the distinctive mound shape that survives today. The example at Killadoon, in County Mayo, is one such survival, quiet and largely unannounced in the landscape.

Most fulachtaí fia date to the Bronze Age, broadly speaking the period from around 2000 to 500 BC, though some have produced dates stretching into the Iron Age. They tend to cluster in low-lying, boggy ground, which both provided the necessary water supply and, in many cases, helped preserve them beneath accumulating peat. County Mayo, with its abundance of wet, marginal land, is well-suited to their survival. Beyond the monument type itself and its location near Killadoon, the specific history of this particular site remains sparsely documented at present.