The site covers a rough oval of ground, roughly ten metres north to south and sixteen metres east to west, the material surviving within tillage land where ploughing has almost certainly disturbed the upper layers over many generations.

Fulachtaí fia, the plural form, are low mounds of burnt and shattered stone found in enormous numbers across Ireland, with many thousands recorded nationwide. They date predominantly to the Bronze Age, roughly 1500 to 500 BC, and are thought to represent cooking places where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The resulting debris, stone that fractures under thermal stress and cannot be reused, accumulated into the characteristic horseshoe-shaped mounds that survive today. What makes the Knockraheen site particularly interesting is not its size or preservation but the fact that it does not stand alone. A second fulacht fia lies roughly thirty metres to the south-west, raising the quiet question of whether these were used simultaneously, sequentially, or by different groups returning to a productive spot over generations. That kind of clustering is known elsewhere in Ireland and suggests that certain locations, perhaps near reliable water sources or on well-travelled routes, attracted repeated use across long spans of time.