It is, in fact, the remnant of a fulacht fia, a type of prehistoric cooking site found across Ireland in considerable numbers, typically dating to the Bronze Age. These features are usually identified by the telltale crescent or horseshoe shape of scorched, fire-cracked stone, the accumulated debris of repeated heating. The process involved dropping stones heated in a fire into a water-filled trough until the water boiled, a method that left behind exactly the kind of burnt mound visible at Lisbane today.

The mound here is sub-circular in plan, measuring 8.1 metres north to south and 8.4 metres east to west, with a modest height of around 0.25 metres across most of its surface. The southern edge is notably more pronounced, rising to approximately 0.5 metres, which reflects how the slope of the SE-facing ground has affected the way material accumulated and weathered over centuries. It sits in marshy pasture, which is entirely characteristic of these sites; fulachta fia are almost invariably found near water sources or in low-lying, wet ground, since access to water was central to how they functioned. The site was recorded and compiled by Denis Power, with notes uploaded in August 2011.

The site is on private agricultural land, so access would require permission from the landowner. There is nothing visually dramatic about what remains; the mound is subtle, and without knowing what to look for, it would be easy to walk past it entirely. If you do get the opportunity to visit, the best time is likely late summer or early autumn, when pasture grass is lower and the slight rise in the ground is more legible. What makes it worth pausing over is less the mound itself and more what it implies: a patch of boggy Limerick farmland that was, at some point in prehistory, a place of regular activity, fire, and communal use.