Look more closely and you will notice a square concrete manhole cover set into its top, a jarring modern intrusion into something considerably older. The mound is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically consisting of a mound of fire-cracked stone accumulated beside a trough that was repeatedly heated and used to boil water. Thousands of these sites survive across the island, most of them Bronze Age in date, and they tend to cluster near water and low-lying ground, which helps explain their frequency in places just like this.

This particular example in Magheragillerneeve is roughly oval in plan, measuring approximately nineteen metres north to south and nearly sixteen metres east to west, rising to about a metre in height. The mound is composed of the characteristic heat-shattered stone packed into charcoal-rich soil, the accumulated debris of many cycles of heating and discarding. A field drain running east to west cuts across the base of the mound on its northern side, a reminder that the wet pasture surrounding it has been managed and reworked over generations, even as the prehistoric mound itself endured. A second fulacht fia lies roughly 225 metres to the west-southwest, suggesting that this stretch of Sligo landscape was a focus of repeated activity rather than a single isolated episode. The proximity of two such sites is not unusual; fulachtaí fia often appear in loose clusters, perhaps reflecting seasonal use of particular territories over long periods.