These horseshoe-shaped mounds, typically found near water, are the remnants of ancient cooking sites, though theories about their precise function have multiplied over the years to include everything from communal feasting to brewing and even bathing. The one at Corraun, on the broad peninsula that pushes out into Clew Bay in County Mayo, is a quiet addition to that vast prehistoric record.

The basic mechanism of a fulacht fia is straightforward: stones were heated in a fire, then dropped into a water-filled trough, bringing the water to a boil rapidly. Over time, the stones cracked and shattered from thermal stress, and the broken fragments accumulated into the distinctive crescent mound that survives today. Most examples in Ireland date from the Bronze Age, roughly 1500 to 500 BC, though some sites have earlier or later phases of use. The Corraun peninsula, jutting into one of the most island-scattered bays on the west coast, would have offered the kind of low-lying, waterlogged ground that made these sites practical, with ready access to both fuel and flowing water.

Beyond its classification and location, the specific details of this particular site remain sparse in the available record. What is certain is that it represents a moment, or many repeated moments, of organised communal activity in a landscape that was already well inhabited long before any written account of it existed.