It measures roughly 3.5 metres on one axis and 5.7 metres on the other, rising only 0.45 metres at its highest point. A field drain cuts straight through its centre, and another runs along its south-western edge. What makes this particular feature quietly arresting is what it appears to be made of: burnt stone and charcoal, the signature material of a fulacht fia.

A fulacht fia is a type of prehistoric cooking or heating site, typically identified by a horseshoe-shaped mound of fire-cracked stone discarded after repeated use in boiling water. They are found in their thousands across Ireland, most often in low-lying, marshy ground, and this one in Corbally fits that pattern exactly. The mound lies just 4.5 metres south-west of a recorded fulacht fia, and the relationship between the two is not straightforward. A layer of burnt material, running some 8 to 10 metres in length, is visible in section within the adjacent field fence, suggesting that whatever was once here extended further than the mound alone. It is possible that the two features were originally part of the same larger site, later divided and obscured by the field boundaries, drains, and fences that subsequent generations imposed on the landscape. The honest archaeological position is that the evidence allows for more than one interpretation, and no excavation has resolved the question.

What survives is modest by any measure, a barely perceptible rise in wet pasture, bisected by drainage works and hemmed in by fencing. Yet the burnt stone and charcoal visible at the edges of that drain represent material that was heated, used, and discarded by people working this same damp ground thousands of years ago. The field system that now cuts through it is itself long established, old enough to have become part of the difficulty in reading what lies beneath.