The one at Commons in County Cork sits quietly in pasture on the western side of a stream, its low horseshoe-shaped mound of burnt and shattered stone still readable in the landscape after what may be thousands of years.

A fulacht fia, at its simplest, is the remains of an ancient outdoor cooking place, typically Bronze Age in date. The usual interpretation is that stones were heated in a fire, then dropped into a water-filled trough to bring it to the boil, a process that left behind accumulating heaps of cracked, heat-shattered material. The Commons example measures 11.6 metres east to west and 10.7 metres north to south, with a maximum height of only 0.4 metres, so it sits low and unassuming in its field. The opening of the horseshoe, around 3 metres wide, faces north, and the western half of the mound is noticeably lower than the eastern half, suggesting either differential survival or variation in how the site was used and built up over time. It was recorded by Bowman in 1934, at that point on land belonging to E. Linehan, and the proximity to a stream is entirely typical; reliable water was essential to the whole operation.