It is a fulacht fia, a type of prehistoric cooking or processing site found in considerable numbers across Ireland, typically consisting of a horseshoe-shaped mound of fire-cracked stones accumulated beside a water source. At Knockaneroe, even that mound is gone to the eye, absorbed into farmland that has been levelled and turned over across successive generations.

What anchors this site to the record at all is a 1943 Ordnance Survey six-inch map, which shows a mound at this location. That cartographic detail is now the primary evidence that anything was ever here. The site does not stand alone in the landscape, at least not in any archaeological sense: it is one of a pair of adjacent fulachta fiadh, its companion recorded separately nearby. Such clustering is not unusual. Fulachta fiadh, which date broadly to the Bronze Age though some examples span a wider period, are among the most commonly recorded prehistoric monument types in Ireland, and they frequently appear in proximity to one another, perhaps reflecting repeated use of a favoured spot near water or within a particular territory.