The one at Gortnaboul, in County Clare, is a quiet representative of a type that has puzzled archaeologists for generations. A fulacht fia, in its simplest form, is a burnt mound, the accumulated debris of a cooking or industrial process that involved heating stones in a fire and dropping them into a water-filled trough to bring the liquid to a boil. The stones, cracked and blackened by the thermal shock, were discarded after use, and over time these spreads of shattered, fire-reddened rock built up into the low, horseshoe-shaped mounds that survive today.

Most fulachtaí fia date to the Bronze Age, roughly 1500 to 500 BC, though some examples have returned dates outside that range. The purpose of these sites has been debated at length. Cooking is the most widely accepted explanation, supported by experimental archaeology that has demonstrated how efficiently the method works, but brewing, hide-processing, and even bathing have all been proposed as alternatives, and it is likely that no single explanation accounts for every example. The Gortnaboul site sits within a county that has no shortage of prehistoric monuments, from the limestone pavements of the Burren with their megalithic tombs to the many ringforts and field systems that dot the landscape. A burnt mound in this context is easy to overlook, modest in scale and unspectacular in appearance, which is perhaps why so many have survived undisturbed for so long.

Because detailed site-specific information for Gortnaboul is limited at present, it would be difficult to say precisely what condition the mound is in, how large it is, or exactly where within the townland it lies. Gortnaboul itself is a small rural townland, and anyone hoping to locate the monument on the ground would do well to consult the relevant Ordnance Survey mapping and approach with the usual courtesies where private land is involved.