It is a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland, typically identified by a horseshoe-shaped mound of fire-cracked stone and charred material left behind after repeated use. The usual method involved heating stones in a fire, then dropping them into a water-filled trough to bring the water to a boil. Over time, the shattered, heat-spent stones were raked aside, gradually building up the characteristic mound. At Moyny, that mound has been levelled, worn down by centuries of agricultural use until whatever shape it once held has been lost.

What makes the site at Moyny quietly notable is not the mound itself, much reduced as it is, but its relationship to the one that lies roughly fifty metres to the east. Two fulachtaí fia in such proximity is not unheard of, but it raises the kind of questions that tend to go unanswered: whether both were in use at the same time, whether one preceded the other by generations, or whether the stream to the west was the shared reason both sites were established where they were. Running water was a practical necessity for this type of site, and the positioning of fulachtaí fiadh near streams or boggy ground is one of the most consistent patterns in their distribution across the Irish landscape.