The mound, roughly ten to eleven metres north to south and about half a metre high, is made up of dense concentrations of small limestone fragments packed into dark, almost blackened soil. That combination is the giveaway: this is a fulacht fia, the remains of a Bronze Age cooking site where stones were heated in fire and dropped into a water-filled trough to bring it to the boil. The discarded, fire-cracked stones accumulated over time into the characteristic crescent or horseshoe shape that survives here at Knockycallanan.

What makes this particular example worth noting is the clarity of its relationship to water. A spring rises from the base of a rocky cliff face three metres to the south-east of the mound, emerging from the rock at the edge of a terrace where the geology transitions from cliff to open limestone pavement. The eastern side of the mound shows a shallow depression that most likely marks where the trough was cut, and it faces directly towards the wet ground fed by that spring. A further slight indentation on the south-western side is also bordered by damp ground. The site sits on a north-facing rocky terrace, with natural limestone pavement lying adjacent to the north and east, and a small concrete well house, which taps into the same spring, stands about ten metres to the north, a more recent intrusion into a much older landscape arrangement. The setting, a reliable water source, a sheltered terrace, and accessible stone, reflects the practical logic that guided the choice of fulacht fia locations across Ireland during the Bronze Age.