That footprint, modest enough from a distance, marks the remains of a fulacht fia, one of the most common yet persistently mysterious monument types in the Irish archaeological record. These are Bronze Age cooking sites, broadly speaking, where stones were heated in fire and then dropped into a water-filled trough to bring it to a boil. The process left behind a characteristic mound of cracked, fire-reddened stone, and Ireland has thousands of them, scattered across boggy ground, river margins, and, as here, agricultural land that has been worked for generations since.

The site at Kilboultragh survives in tillage, meaning it has been subject to repeated ploughing over the years, which accounts for the spread rather than mounded form the material now takes. What was once a low horseshoe-shaped mound, the typical profile of a fulacht fia, has been flattened and dispersed across that roughly rectangular area. Dating these sites is rarely straightforward without excavation, but fulachta fia in Ireland are generally associated with the Bronze Age, broadly the period from around 2000 to 500 BC. Their precise function remains debated; cooking is the conventional explanation, but brewing, textile processing, and bathing have all been proposed by researchers over the years.