This is a fulacht fia, a type of ancient cooking site found in enormous numbers across Ireland. The basic idea is simple: stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, and used to cook meat or, as some researchers now argue, to brew, process hides, or bathe. The shattered, heat-cracked stones were discarded in a mound nearby, and it is that accumulation of burnt and blackened material that survives as the visible trace of the site today.

The remains at Kilfinny sit in gently undulating, low-lying pasture, the kind of waterlogged ground these sites typically favour, since a reliable water source was essential to their function. The spread of burnt material measures roughly nine metres north to south and ten metres east to west, making it a reasonably substantial example. It lies immediately to the west of a drainage trench cut along the western edge of a north-south field boundary, and the exposed eastern side of that trench reveals the burnt material continuing to a depth of around 0.3 metres below the present ground surface. That visible cross-section, where the trench has sliced through the deposit, gives some sense of how much material has accumulated over time. The record was compiled by Denis Power and uploaded to the national monuments database in August 2011.

The site sits within ordinary agricultural land, and there is no formal visitor infrastructure. The field boundary and drainage trench that accidentally exposed the deposit's profile are the clearest physical reference points for locating it on the ground. Because the burnt material lies partly below present ground level, much of what survives is not immediately visible as a raised mound, as fulachtaí fia often appear elsewhere. Visiting in late autumn or winter, when vegetation dies back, gives the best chance of reading the ground surface. As with most such sites on private farmland, access depends on the goodwill of the landowner, and the modest scale of what is visible above ground rewards a certain patience with inconspicuous archaeology.