It measures 13.1 metres north to south and 8.5 metres east to west, rising to a height of 1.5 metres, with steeply sloping sides and a narrow mouth just 1.4 metres wide. The river is slowly winning against it; the tip of the north-west arm is being eroded, and burnt material spills out there and along the east edge of the mound.

This is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, particularly in low-lying or waterside locations. The characteristic horseshoe or kidney shape comes from the accumulated mound of fire-cracked stones that built up over repeated use. The typical method involved heating stones in a fire and dropping them into a water-filled trough to bring it to the boil, a process efficient enough to cook large quantities of meat. The mounds are composed almost entirely of this shattered, blackened stone, which is why burnt material is visible wherever the mound is disturbed or cut. Most fulachta fia date to the Bronze Age, roughly 1500 to 500 BC, though some have earlier or later origins. The Uragh example follows the classic form closely, positioned precisely where such sites tend to appear, close to a reliable water source in open ground.