The one at Dromultan in County Kerry is a local example of a monument type that archaeologists have spent decades arguing over. A fulacht fia typically survives as a horseshoe-shaped or kidney-shaped mound of fire-cracked stone and dark, charred earth, usually found close to a water source. The mound is the debris left over from repeated use of a trough, dug into the ground and lined to hold water, which was brought to the boil by heating stones in a fire and dropping them into the water. When the stones cracked and became useless, they were tossed aside, and over generations the discarded material built up into the distinctive mound visible today.

What the troughs were actually used for remains genuinely contested. Cooking meat is the long-standing explanation, and experiments have shown it works reasonably well. But researchers have also proposed uses ranging from textile preparation and leather-working to bathing or even brewing. Most fulachtaí fia date to the Bronze Age, roughly between 1500 and 500 BC, though some sites show evidence of use across much longer periods. They are found in particularly high concentrations in Munster, making Kerry fertile ground for them. The Dromultan site sits within this broader regional pattern, a faint but legible trace of repeated human activity in a landscape that was already being farmed and managed long before any written record.