This is a fulacht fia, a type of site found in extraordinary numbers across Ireland, typically interpreted as an ancient cooking place. The standard method involved heating stones in a fire, dropping them into a water-filled trough to bring it to a boil, and using that heat to cook meat. The stones, cracked and spent from repeated heating, were discarded to the side, building up over time into the horseshoe-shaped or irregular mounds that survive today. This particular example measures fourteen metres long and sixteen metres wide, with its opening facing north, consistent with the form seen at hundreds of comparable sites.

What makes Knockshanawee quietly notable is not the single mound but the fact that a second fulacht fia lies only about ten metres to the north-east. The proximity of the two sites raises questions that archaeology has not definitively answered for any such pairing: were they used simultaneously by different groups, or at different periods, or did the same community simply exhaust one trough and establish another nearby? The stream on the eastern bank of which both mounds sit would have been essential to the whole operation, providing the steady water supply that the cooking process demanded. Bronze Age fulachtaí fia are the most commonly identified field monuments in Ireland, yet the routines and social arrangements behind them remain only partially understood.