The mound rises no more than ten centimetres at its highest point, and measures roughly fourteen metres across in either direction, yet it represents a category of monument found in the hundreds across the Irish countryside. This is a fulacht fia, a type of prehistoric cooking site, and the barely perceptible rise beneath your feet is composed almost entirely of burnt and fire-cracked stone.

Fulachtaí fia were in use primarily during the Bronze Age, from roughly 1500 BC onwards, though some examples date earlier. The typical arrangement involved a stone-lined trough filled with water, a nearby hearth for heating stones, and a working area where those stones were dropped into the trough to bring the water to a boil. After repeated use, the shattered and thermally exhausted stone was piled to one side, and it is exactly this accumulated waste material that forms the low, horseshoe-shaped or oval mounds visible today. The site at Knockballymartin sits around two hundred metres south of a stream, which is a characteristic proximity; a reliable water source was essential to the whole process. The mound here measures fourteen metres north to south and just over fourteen and a half metres east to west, dimensions that place it comfortably within the range typical of the monument type across Munster and beyond.