It is easy to walk past without a second thought. The mound measures roughly twelve metres north to south and ten metres east to west, rising only about 0.7 metres above the surrounding ground. That modest profile, however, marks it out as a fulacht fia, a type of prehistoric cooking or processing site found widely across Ireland and typically identified by a horseshoe-shaped mound of fire-cracked stone built up beside a trough or water source. The proximity to running water here is no accident; water access was central to how these sites functioned.

A fulacht fia works, broadly, by heating stones in a fire and dropping them into a water-filled trough until the water boils. Over repeated use, the spent and shattered stones accumulate into the characteristic mound that survives in the landscape long after the organic elements have vanished. The site at Clooncoose came to wider attention through a 1994 report by Tom Coffey, who identified four such features at this location. The grouping is notable; individual fulachtaí fia are common across Ireland, but several clustered so closely together in one low-lying spot suggests repeated or intensive use of this particular patch of ground. A second example lies approximately eleven metres to the north-east of the mound described here, and both fall under the same reference in the recorded monuments register.