Overgrown and easy to mistake for a natural rise in the land, it is in fact one of the most common yet least-visited categories of ancient monument in Ireland, a fulacht fia, and its unassuming appearance conceals a quiet antiquity.

Fulachtaí fia are prehistoric cooking sites, found in their thousands across Ireland, typically in low-lying or wet ground. The standard interpretation is that they functioned as outdoor boiling places: stones were heated in a fire, then dropped into a water-filled trough to bring it to temperature. Over repeated use, the stones cracked and became unusable, and the discarded fragments accumulated in a horseshoe-shaped mound around the trough. The charred, shattered stone is exactly what gives these sites their characteristic dark, fire-blackened appearance, and it is this burnt material that forms the mound visible at Monalahy today. The association with marshy ground is not incidental; a ready water supply was essential, and the boggy soils that made such sites practical also helped preserve them through the centuries.