It is easy to walk past without registering what it is: a fulacht fia, the term used for a type of prehistoric cooking site found in enormous numbers across Ireland and Britain. The basic principle involves heating stones in a fire and dropping them into a water-filled trough to bring it to a boil, a method that leaves behind exactly the kind of irregular mound of shattered, blackened stone visible here.

The spread at Knocknamallavoge is notably substantial. The main concentration of burnt material measures roughly forty metres east to west and thirty-three metres north to south, a generous footprint for a site of this type. A second, smaller deposit, around twelve metres long, lies directly to the south. Whether this represents a separate episode of activity or simply an outlying portion of the same site has not been firmly established, and the ambiguity is itself telling: fulachtaí fia were often used repeatedly over long periods, and the boundary between one phase of use and another can be difficult to draw in the archaeological record.