It looks, at a glance, like a slight irregularity in the ground, a gentle swelling in the turf. What lies beneath, however, is a spread of burnt material marking the site of a fulacht fia, one of the most common yet persistently mysterious monument types in the Irish archaeological landscape.

Fulachtaí fia (the plural form) are found in their thousands across Ireland, typically beside streams or marshy ground where water was readily available. The prevailing interpretation is that they functioned as cooking sites, probably during the Bronze Age, though the period of their use spans roughly from 1500 BC into the early medieval centuries. The usual method involved heating stones in a fire until they were intensely hot, then dropping them into a water-filled trough to bring the water to a boil. The crescent or horseshoe-shaped mounds that remain today are composed largely of those fire-cracked, shattered stones, discarded after use. The proximity of the Mountkeeffe example to the Rampart Stream fits this pattern precisely, since a reliable water source was not incidental to the process but central to it. Alternative theories have proposed that fulachtaí fia served as bathing facilities, textile-processing sites, or even brewing vats, and the debate has not been entirely settled, which gives these modest mounds a quiet complexity that their unassuming appearance does little to advertise.