Nothing protrudes, nothing is fenced off, and nothing announces itself. The only surviving evidence that anything happened here is a notation on a 1937 Ordnance Survey six-inch map, where a cartographer recorded it as "fulacht fiadh (site of)", the parenthetical qualification suggesting the surface traces had already vanished by that point.

A fulacht fia is a type of prehistoric cooking site found in large numbers across Ireland, typically identified by a horseshoe-shaped mound of burnt and shattered stone left over from repeated heating and water-boiling. They cluster near water sources, and this example is no exception, sitting adjacent to a spring. What makes the Knocklagh site particularly interesting is that it almost certainly was not alone. A researcher named Bowman, writing in 1934, recorded what appears to be a group of four fulachta fiadh on land belonging to a D. Fitzgerald in this area, and the Knocklagh site is thought to be among them. A second such site lies roughly 110 metres to the south-west, close enough to suggest the landscape here was once a place of repeated, organised activity rather than a single isolated episode. Whether these represent seasonal use by the same community over generations, or something more specific, is the kind of question that tends to outlast the physical evidence.