There is no mound, no hollow, no surface feature of any kind to betray it, yet the archaeological record places it firmly here, on the western side of a stream, precisely where Bronze Age people would have chosen to be.

A fulacht fia, sometimes called a burnt mound, is among the most common prehistoric monuments in Ireland. The basic idea is straightforward: stones were heated in a fire, dropped into a water-filled trough, and used to bring the water to boiling point for cooking or possibly other purposes such as bathing or textile work. The spent, shattered stones were raked aside after each use, gradually accumulating into the characteristic horseshoe-shaped mound. At Bettyville, that mound was still visible enough to be marked on the Ordnance Survey six-inch map of 1937, but by the time later fieldwork was carried out, nothing remained above ground. A researcher named Bowman, writing in 1934, recorded two fulachta fiadh on land belonging to an O. Moynihan in this area, and this site is believed to be one of them. Its companion, catalogued separately, sits roughly 110 metres to the north-east, making this a small cluster of related prehistoric activity rather than an isolated find. The proximity of both sites to water is entirely typical; a reliable stream was as essential to the process as the fire itself.