These low, horseshoe-shaped mounds, typically found near water sources, are the remnants of Bronze Age cooking sites, where stones were heated in fire and dropped into water-filled troughs to bring them to the boil. The process left behind cracked and shattered stone, and over time these accumulations built up into the distinctive mounds that survive today, often inconspicuous in a field corner or at the edge of boggy ground. The example recorded at Baile Uí Uaithnín in County Kerry is one such site, quietly occupying its place in a county that holds a remarkable concentration of prehistoric remains.

The mechanics of a fulacht fia are straightforward enough to reconstruct from the archaeology, though debate continues about exactly what these sites were used for. Cooking is the most widely accepted explanation, but some researchers have suggested uses ranging from textile processing to bathing. What is consistent across sites is the evidence of repeated, sustained activity, implying these were not one-off events but places returned to again and again. Kerry, with its combination of upland bog and sheltered valleys, preserves many such sites in good condition, the damp ground that once fed the necessary water supply now helping to keep the mounds intact.