To the untrained eye there is nothing remarkable about it, which is precisely what makes the category so quietly compelling. These mounds, typically crescent- or horseshoe-shaped, built up over centuries from the cracked and fire-shattered stones that accumulated during use, are among the most common archaeological monuments on the Irish landscape, yet most people walk past them without a second glance.

The working principle of a fulacht fia involved heating stones in a fire and then dropping them into a water-filled trough, usually timber-lined, to bring the water to a boil. The process was efficient, and the sites tend to cluster near reliable water sources, which explains why this particular example sits on the southern side of a stream. The boggy, waterlogged ground that makes the terrain awkward today was likely part of the appeal in prehistory, guaranteeing a steady water supply. What makes Liskillea especially interesting is the density of similar monuments in the immediate vicinity: three further fulachta fiadh have been recorded further downstream along the same watercourse, suggesting this stretch of ground saw repeated or sustained prehistoric activity rather than a single isolated episode of use. The mound itself is heavily overgrown with furze, the dense spiny scrub that tends to colonise undisturbed raised ground in wet areas, which both obscures the monument and, in a way, protects it.