Beneath that subtle contrast lies a low circular mound, roughly fourteen metres north to south and eight metres east to west, built from small fragments of fire-cracked stone packed into black soil. It is the kind of site that rewards a careful eye rather than a dramatic reveal.

Burnt mounds of this type are among the most common prehistoric monuments in Ireland, yet they remain quietly overlooked. They are the accumulated debris of repeated heating, where stones were fired and then plunged into water-filled troughs to bring the water to the boil, a process repeated until the stones cracked and were discarded into a growing heap. What they were actually used for, whether cooking, bathing, textile processing, or something else entirely, is still debated. What is not in doubt is that the site at Carrowmoran was busy in prehistory. Sitting on the western bank of a stream, which would have supplied the essential water, this mound is not alone. Another burnt mound lies just four metres to the south, and roughly forty metres beyond that sits a fulacht fia, the Irish term for the broader class of site that encompasses the trough, the hearth, and the mound together. Three related monuments in such close proximity suggest this was a place people returned to, worked at, and built up over time rather than a single incidental event.