These low, horseshoe-shaped mounds are among the most common prehistoric monuments in Ireland, yet they are easy to miss precisely because the land around them has so often been reshaped by later farming. A fulacht fia is thought to represent an ancient cooking site, typically dated to the Bronze Age, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The burnt, shattered stone that accumulates over generations of use forms the distinctive mound that survives to the present day.

The Derryleigh example sits on the western side of a field drain, and the scorched spread still visible along the ditch gives some sense of the activity that once took place here. What makes the location a little more arresting is that a second fulacht fia lies only about forty metres to the north-east. Paired or clustered examples like this are not unheard of across Ireland, and their proximity raises quiet questions about how and why people returned to the same stretch of ground, possibly across many generations, to carry out the same labour-intensive process of heating water in the open air.