They appear as low, horseshoe-shaped mounds, typically found near water, and are thought to date mainly from the Bronze Age, roughly 1500 to 500 BC. The leading theory holds that they were cooking sites: a trough dug into the ground and lined with wood or stone would be filled with water, and rocks heated in a nearby fire would then be dropped in to bring the water to a boil. The burnt and shattered stones, discarded after use, gradually accumulated into the distinctive mound that survives today. At Berneens in County Clare, one such site lies quietly in the landscape, carrying that same ancient domestic logic.

The site at Berneens is recorded as a fulacht fia, placing it within a tradition that appears throughout Clare and across the country, wherever Bronze Age communities settled near reliable water sources. The townland name, Berneens, likely derives from the Irish, and the area sits within a county that has long been recognised as particularly rich in prehistoric remains, from the limestone pavements of the Burren to the earthworks and burial monuments that punctuate its interior. The fulacht fia as a monument type was largely overlooked by antiquarians for generations, partly because the mounds are modest and easily mistaken for natural features. It was not until the twentieth century that systematic excavation and experimental archaeology brought them into sharper focus, with researchers even replicating the cooking process to test how efficiently the method worked. The results were consistently impressive, suggesting these were practical, well-understood technologies rather than ritual curiosities, though some scholars continue to debate whether cooking was their only or even primary function.