To a casual eye it reads as a slight rise in the ground, easy to step over and easier still to ignore. But the dark, charcoal-rich soil beneath the sod, and the dense scatter of fire-shattered rock it contains, are the calling cards of a fulacht fia, one of the most common yet persistently mysterious monument types in the Irish archaeological record.

A fulacht fia is broadly understood to have functioned as a prehistoric cooking site, though scholars continue to debate the full range of activities carried out at such places. The typical arrangement involved a trough filled with water, stones heated in a fire nearby, and those stones then plunged into the trough to bring the water to a boil. The cracked, heat-fractured stones were discarded after use, and over time their accumulation formed the horseshoe-shaped or oval mounds that survive across Ireland in their thousands, almost always close to a water source. The Corbally example fits this pattern closely: roughly oval in plan, measuring twelve metres on its northeast-to-southwest axis and just under sixteen metres on its northwest-to-southeast axis, and rising to a modest height of around 0.8 metres. It sits directly adjacent to an old watercourse, now serving as a field drain, in ground that remains rough and wet. A modern field drain, about 1.3 metres wide and now partly infilled, bisects the mound along a northeast-to-southwest line, cutting through what was once an unbroken deposit. A shallow surface depression, roughly 0.8 metres wide, also crosses the top of the mound on an east-to-west axis along its southern half, hinting at further disturbance or perhaps an older feature. A second, smaller mound lies just 4.5 metres to the south, suggesting this was not an isolated episode of activity but part of a localised cluster of use.