It measures roughly eleven metres north to south and six metres east to west, rising less than a metre above the surrounding ground. That modest profile is the accumulated residue of repeated prehistoric cooking, the physical signature of a fulacht fia.

A fulacht fia is a type of Bronze Age cooking site found in enormous numbers across Ireland, typically positioned close to a water source. The basic method involved heating stones in a fire and then dropping them into a water-filled trough to bring the water to a boil. The stones, cracked and spent after each use, were discarded to one side, and over generations these heaps of shattered, scorched material built up into the horseshoe-shaped or oval mounds visible today. Ireland has more recorded examples than almost anywhere else in the world, yet each one marks a specific and deliberate choice of location. Whoever used this site on Mangerton chose the north-east bank of a stream at some elevation on a mountain slope, a choice that says something, if we could read it fully, about movement, seasonality, and the rhythms of life in the uplands during the Bronze Age.