To the casual eye it might look like little more than a slight rise in the ground, but the material that makes up its curve tells a different story: burnt stone, cracked and blackened, heaped into the distinctive arc that archaeologists have come to recognise as a fulacht fia.

Fulachtaí fia are among the most common prehistoric monuments in Ireland, found in their thousands across the country, yet they remain somewhat mysterious in terms of their exact purpose. The basic principle is well understood: stones were heated in a fire, then dropped into a water-filled trough to bring it to a boil. The repeated heating and sudden cooling caused the stones to fracture and shatter, and once spent they were raked out and piled to the side, forming over time the characteristic mound. What exactly was being boiled or cooked, and whether these sites served a domestic, communal, or ritual function, is still debated. The horseshoe or kidney shape of the mound is a direct consequence of that process, with the trough typically positioned at the open end of the arc. Most examples date to the Bronze Age, roughly 2000 to 500 BC, though some are earlier or later. The Knockrour example, sitting close to its stream, follows the pattern closely: ready access to water was essential, and fulachtaí fia are almost always found near rivers, streams, or marshy ground.