The one recorded at Skehavaud in County Mayo is a single representative of a monument type so common that it has been estimated to account for a third of all known archaeological sites in Ireland, yet so poorly understood that scholars still argue about what these sites were actually for. The name, loosely translated from the Irish, is sometimes rendered as "cooking place of the deer" or "wild deer roasting pit", which gives a flavour of how they were long interpreted, though that reading is now contested.

A fulacht fia typically consists of a horseshoe-shaped mound of heat-shattered stone, usually surrounding or adjacent to a trough cut into the ground. The standard explanation, and one backed by experimental archaeology, is that stones were heated in a nearby fire and dropped into a water-filled trough to bring it to the boil, a method of cooking or processing that left behind the characteristic cracked and discarded stone that forms these low, often waterlogged mounds. Most date to the Bronze Age, roughly 1500 to 500 BC, and they tend to cluster near streams or marshy ground where water was readily available. Alternative theories have proposed uses ranging from textile dyeing and hide processing to communal bathing. The honest position is that the sites were probably used for several different purposes across their long period of use, and no single explanation fits all of them. The Skehavaud example sits within this broader, unresolved story, one more mound of burnt stone in a wet Mayo field, waiting for closer attention.