The one at Ballyguin in County Mayo is typical in its anonymity: a low, horseshoe-shaped mound of fire-cracked stone, dark soil, and charcoal, sitting quietly in the landscape with little to mark it out as anything at all. That ordinariness is, in its own way, the point.

Fulachtaí fia, which translates loosely from the Irish as "cooking places of the deer" or "cooking pits of the wild," date predominantly to the Bronze Age, roughly 1500 to 500 BC, though some examples are older or younger. The typical arrangement involves a timber-lined trough sunk into the ground near a water source, a hearth for heating stones, and the mound itself, which is essentially a discard heap of stone that has been heated, used, and cracked beyond further use. The stones were placed in fire, then dropped into the water-filled trough to bring it rapidly to a boil. What exactly was being cooked, or whether cooking was always the primary purpose, remains a matter of debate among archaeologists. Some researchers have proposed that these sites served as saunas, textile processing areas, or brewing facilities. The Ballyguin example sits within a county that has produced a considerable number of such sites, Mayo's wet, low-lying ground being well suited to preserving the waterlogged conditions in which these monuments tend to survive.

Beyond its classification and location, the specific details of this site, its dimensions, its precise setting within the townland, and its current condition, are not presently available in the public record. What can be said is that Ballyguin holds a small piece of a very long story, one repeated in fields and bogs across the country, wherever Bronze Age communities stopped long enough to light a fire and heat some stones.