It measures ten metres by eight, rises only thirty centimetres above the surrounding ground, and is composed almost entirely of burnt material. That last detail is the key to understanding what it is. This is a fulacht fia, a type of prehistoric cooking or processing site found in enormous numbers across Ireland, typically identified by exactly this kind of scorched, fire-cracked stone mounded beside a water source. The stones would have been heated in a fire and dropped into a water-filled trough to bring the water to a boil, repeated use eventually rendering them too damaged to serve again and so discarded in a spreading heap.

The site was recorded by Bowman in 1934, a period when local antiquarian fieldwork was quietly cataloguing features that might otherwise have been ploughed away or forgotten entirely. By that point the nearby well had already fallen out of use, and it is now drained, removing one of the most legible clues to why this particular spot was chosen. Fulachtaí fia tend to cluster near reliable water sources, and the combination of a stream to the west and a well close by would have made Euglaune a practical location for whatever activity, cooking, textile processing, or otherwise, the site once supported. The mound itself is the residue of repeated use over what may have been a considerable span of time.