It is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically Bronze Age in origin. The usual interpretation is that stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, and used to cook meat. Over repeated use, the spent and shattered stone accumulated into a horseshoe or, in this case, triangular mound around the trough. The siting beside water and on flood-prone ground is entirely typical; these monuments are almost always found near a reliable water source.

The mound at Moneen is modest but legible. It measures roughly 10.8 metres along its south-west to north-east axis, about 10 metres across from south-east to north-west, and rises to a maximum height of 1.5 metres, its surface covered in grass that softens but does not quite conceal the burnt stone beneath. A shallow depression, only 10 to 20 centimetres deep, sits on the surface, and along the eastern edge three set stones project just above the sod, each running about 1.3 metres in length. These stones are thought to mark the original trough area, the point around which the whole process of heating and cooking would have been organised. The site was noted on Robinson's map in 1977, giving it a recorded presence of several decades even if it remains little visited.