It measures roughly twelve metres across and barely half a metre high, sod-covered and easy to overlook. A slight depression on its eastern side may mark where a trough once sat. This is a fulacht fia, a type of prehistoric cooking site found widely across Ireland, typically dated to the Bronze Age, in which water-filled troughs were heated by dropping fire-cracked stones into them. The shattered, burnt stone was then raked out and discarded, and over centuries those discarded fragments accumulated into the crescent-shaped or rounded mounds that survive today. The blackened, charcoal-saturated soil that gives sites like this their distinctive dark matrix is the compacted residue of that repeated process.

What makes the Lisduvoge example quietly interesting is its setting within a small cluster of related features. A second fulacht fia lies approximately sixty-five metres to the south, suggesting that this margin of wet ground was returned to, or perhaps continuously used, over some period of time. Forty metres to the south-west there is also a recorded enclosure, hinting that the area held more than one kind of human activity. The proximity to wet ground is typical; fulachtaí fia are almost always found near a reliable water source, and the boggy, poorly drained land that made this part of Mayo less attractive for later intensive agriculture is likely the reason these features have survived at all.