It measures roughly twenty metres east to west and nine metres north to south, and it is composed almost entirely of burnt, fire-cracked stone. This is a fulacht fia, a type of prehistoric cooking site found in abundance across Ireland, typically beside water or in wet ground. The basic principle involved heating stones in a fire, dropping them into a water-filled trough to bring it to the boil, and using that trough to cook meat. Thousands of these sites survive across the country, usually as low, horseshoe-shaped or oval mounds of the discarded burnt stone that accumulated over repeated use.

This particular mound is barely perceptible at ground level, blending into the soft, wet landscape around it. It was recorded by Bowman in 1934, noted at the time as sitting on land belonging to a M. O'Connell, which places it in the documentary record even if its precise prehistoric date remains unspecified. Like most fulachtaí fia, it likely dates somewhere within the Bronze Age, a period during which these sites were in widespread use across Ireland, though the marshy conditions that helped preserve it also make it easy to overlook. The combination of slight topography and waterlogged ground is, in its own quiet way, exactly the environment these sites were designed to exploit.