It rises no more than half a metre at its highest point, stretches roughly seven and a half metres from north to south, and sits on a small natural terrace with marshy ground pressing in from the south. The most arresting feature is not the mound itself but the hollow carved into its centre: a well-defined rectangular depression with a flat bottom, from whose south-eastern corner a narrow channel cuts cleanly through the side of the mound and continues, marked by a thick line of rushes, curving downhill for about two metres. The whole arrangement looks deliberate, purposeful, and old.

The resemblance to a fulacht fia is what makes this site genuinely puzzling. A fulacht fia is a type of prehistoric cooking site, common across Ireland, typically consisting of a horseshoe-shaped mound of fire-cracked stone surrounding a trough that would once have been filled with water and heated using hot rocks. The mounds at such sites are almost always composed of shattered stone, the debris of repeated burning and quenching. Here, there is none. Not a single stone has been recorded on the mound or inside the depression, and the trough is unusually crisp and well-defined compared with the worn, irregular profiles typical of genuine fulachta fiadh. The channel draining from the depression's corner is consistent with the kind of water management you might expect at such a site, which only deepens the puzzle, given that there is no stream nearby and any water present would have come from surface run-off alone.

What sits at Lecarrow, then, is something that mimics the form of a well-understood monument type without quite fitting it. Whether it is a variant, an analogue built in a stoneless environment, or something else entirely, the site currently resists a clean answer. The rushes growing thickly in the depression and trailing off downhill are the most visible sign that something structural underlies the ground, quietly holding its shape after what may be a very long time.