The one at Carrowlagan, in County Clare, is a typical example of a feature type that is anything but ordinary once you begin to consider what it represents: a low, kidney-shaped or crescentic mound composed almost entirely of heat-shattered stone and charred material, left behind by repeated episodes of fire and water that took place somewhere between the Bronze Age and the early medieval period.

The prevailing interpretation of burnt mounds, known in Irish as fulacht fiadh, is that they were cooking sites. The method was simple but effective: stones were heated in a fire, then dropped into a water-filled trough, usually timber-lined, until the water reached boiling point. The cracked and discarded stones were pushed aside after each use, gradually accumulating into the characteristic mound. Some researchers have proposed alternative uses, including bathing, textile processing, or brewing, and the debate has not been fully settled. What is consistent across most sites is the evidence of sustained, repeated use, suggesting these were not one-off events but established places of communal activity. Carrowlagan sits in a part of Clare where such monuments are not uncommon, tucked into a landscape shaped by glacial drift and the slow work of small watercourses, the proximity to water being a near-universal feature of the type.