No ridge in the grass, no scatter of stone, no depression marks the spot. The only record of its above-ground presence is a mound shown on an Ordnance Survey six-inch map from 1936, and whatever that mound once indicated has since been levelled or absorbed back into the field.

The site is a fulacht fia, a class of monument found in enormous numbers across Ireland, particularly in low-lying, waterlogged ground close to streams. The term, loosely translated from Old Irish, refers to a cooking place, and the prevailing interpretation is that these were outdoor sites used for boiling water by heating stones in a fire and dropping them into a water-filled trough. The shattered, heat-cracked stones accumulate over time into a characteristic horseshoe-shaped mound, often dark in colour from charring. Most fulachtaí fia date to the Bronze Age, roughly 1500 to 500 BC, though some may be later. The Skeheen example sits on the eastern bank of a stream, which fits the pattern almost exactly; proximity to a reliable water source is one of the most consistent features of the type. Whether this one was used for cooking, for bathing, for some craft process involving hot water, or for something else entirely, remains an open question that applies to the category as a whole.

What makes this particular example quietly notable is precisely its invisibility. Recorded as a mound within living memory, it now leaves no visible surface trace. It persists in the archaeological record without persisting in the landscape, a site defined almost entirely by its absence.