It is easy to miss, and easier still to misread as a natural feature of the boggy ground. But the shape gives it away: that characteristic lunate or horseshoe form, opening to the west, is the signature of a fulacht fia, a type of Bronze Age cooking site found in enormous numbers across Ireland and Britain. The working principle was straightforward. Stones were heated in a fire, then dropped into a water-filled trough to bring the water to a boil. Repeated heating and quenching shattered the stones, and the discarded fragments gradually built up into the distinctive curved mounds that survive today.

This particular example is a well-preserved specimen. The mound measures roughly 10.7 metres north to south and 5.7 metres east to west, rising to about 0.65 metres in height, with stones still embedded in its summit. The concave, inner face has been reinforced with a single line of set slabs and blocks, reaching up to 0.4 metres high, and masses of burnt stone remain clearly visible at the southern end of the summit. The relationship between the mound and the nearby stream is worth noting. The stream currently skirts around the southern side of the mound, but the shape of the surrounding ground suggests it may once have run to the west, directly in front of the opening of the crescent. That alignment would make functional sense: a Bronze Age user would have wanted the water source close to, and accessible from, the open face of the trough area. Sometime over the intervening millennia, the stream appears to have shifted its course, leaving the mound slightly misaligned with its original water supply.