The one recorded here at Corrantarramud is itself a pair: two grass-covered oblong mounds sitting side by side, with a trapezoidal depression between them that opens out towards the south-west. These mounds are the surviving spoil heaps of a fulacht fia, a type of Bronze Age cooking site found in enormous numbers across Ireland, typically consisting of a trough, a hearth, and a mound of shattered, fire-cracked stone that accumulated as heated rocks were used to boil water and then discarded.

What makes this particular spot quietly striking is the density of activity concentrated here. Two further fulachta fiadh lie to the south-east, meaning the landscape around this stretch of wet ground once supported at least three such sites within close proximity of one another. Nearby, and marked on the third edition of the Ordnance Survey six-inch map published in 1934, is a well recorded as Tobermore. The name suggests a significant spring, and the proximity of all three cooking sites to both this well and the stream to the east is unlikely to be coincidental. Fulachta fiadh are almost always found near water, since the whole process depended on a ready and renewable supply, and marshy low-lying ground of exactly this kind was a favoured setting across prehistoric Ireland.

The two mounds themselves are modest in scale: the larger rises to about 0.8 metres and measures roughly 6.5 by 4.5 metres, while its companion to the west is somewhat lower and smaller, at around 0.4 metres high. Between them, the depression, approximately four metres long and up to three metres wide, is where the trough would once have sat. The grass cover that now softens both mounds makes them easy to overlook in a field, though the paired shape and the hollow between them, read together, are a distinctive signature once you know what you are looking at.