It measures roughly five metres across its longest axis and barely half a metre in height, its flattened top suggesting something deliberate beneath the turf rather than a trick of the land. The working interpretation is that it is a fulacht fia, one of the most numerous and least celebrated archaeological monument types in Ireland.

A fulacht fia, in broad terms, is a prehistoric cooking or processing site, typically identified by a horseshoe-shaped or oval mound of fire-cracked stone and charcoal-rich soil, accumulated through repeated heating of stones and plunging them into water-filled troughs. They are found in their thousands across Ireland, most dating to the Bronze Age, though the type lingered in use across a long stretch of prehistory. This particular example in Ballylarkin was noted during fieldwork carried out in 1987, and the qualification "possibly" in its description reflects a genuine interpretive caution: without excavation, a small mound in a field can only be assessed from the surface, and surface evidence has its limits. The dimensions, the flat top, and the oval plan are all consistent with the type, but the ground has not yet given up a definitive answer.