The one at Darragh in County Clare is a quiet example of a type that archaeology has spent decades trying to fully account for. A fulacht fia, at its most basic, is a burnt mound, typically a horseshoe-shaped heap of fire-cracked stone and dark, charcoal-rich earth found near a water source. The accepted interpretation is that these were ancient cooking sites, where stones were heated in a fire and dropped into a water-filled trough to bring it to the boil, but competing theories have suggested uses ranging from bathing to textile processing to brewing.

Most fulachtaí fia date to the Bronze Age, broadly between 1500 and 500 BC, though some examples have been found with earlier or later activity. The sheer number of them, with estimates running to several thousand recorded sites across Ireland, suggests they were not rare ceremonial features but working, practical installations used repeatedly over time. The dark, humped profile of the mound is what typically survives today, the accumulated debris of many firings, with the wooden trough long since rotted away and the original hollow often waterlogged. County Clare has a fair concentration of such sites, tucked into low-lying or boggy ground of the kind these installations seem to have favoured.