At Carrowlagan in County Clare, one such mound sits in the ground, a low crescent or kidney-shaped spread of fire-cracked stone and dark, charred soil, the accumulated debris of repeated heating and cooling over what was likely a long period of prehistoric use.

Burnt mounds, known in the archaeological literature as fulachta fiadh, are generally dated to the Bronze Age, roughly 2000 to 500 BC, though some have produced dates outside that range. The working theory, supported by experimental archaeology, is that they functioned as cooking sites: stones were heated in a nearby fire, then dropped into a water-filled trough to bring it rapidly to the boil. The shattered, heat-spent stones were then discarded to the side, building up over time into the characteristic mound. Some researchers have proposed alternative uses, including dyeing, hide-working, or bathing, and the debate has not been fully settled. What is consistent is the form: water, fire, stone, and the slow accumulation of waste that marks the spot centuries later. The example at Carrowlagan is one of many such sites recorded across Clare, a county where Bronze Age activity left considerable traces in the landscape.