They appear as low, kidney-shaped or crescent mounds of fire-cracked stone and dark, charred soil, and one such feature lies at Ballyleaan in County Clare. The mounds are easy to overlook, easily mistaken for natural rises in the ground, yet they represent repeated, deliberate activity carried out over generations.

Burnt mounds, known in Irish archaeology as fulachtaí fia, are generally dated to the Bronze Age, roughly between 1800 and 800 BC, though some examples extend earlier or later. The leading interpretation is that they functioned as cooking sites: a trough, typically dug into the ground and sometimes lined with wood or stone, was filled with water, and stones heated in a nearby fire were dropped in to bring the water to a boil. The cracked and spent stones were then raked aside, gradually accumulating into the characteristic mound that survives today. Some researchers have proposed alternative uses, including brewing, hide-working, or bathing, and the debate continues. What is clear is that these sites were often positioned near streams or marshy ground, where water was readily accessible, and Clare's landscape, with its mix of lowland boggy terrain and limestone, provided plenty of suitable locations. The example at Ballyleaan fits within that broader pattern of Bronze Age land use across the county, though the specific details of its size, condition, and immediate setting remain to be fully documented.