A fulacht fia, the term used for a type of prehistoric cooking or industrial site typically identified by a horseshoe-shaped mound of burnt and shattered stone, once registered clearly enough on a 1936 Ordnance Survey six-inch map as a small circular mound. Today there is no visible surface trace. The ground has absorbed it entirely, and cattle graze over it without ceremony.

Fulachtaí fia are among the most common prehistoric monuments in Ireland, found in their thousands across the country, usually in low-lying or waterlogged ground. They are thought to date predominantly from the Bronze Age, and the prevailing interpretation is that they functioned as outdoor cooking sites: water was boiled in a trough by dropping fire-heated stones into it, and the cracked, heat-damaged stone was piled to the side, forming the characteristic mound. What makes the Glenleigh site quietly notable is that it does not stand alone. A second fulacht fia lies immediately adjacent, catalogued separately. Two such sites in close proximity raises questions that the landscape can no longer answer from the surface: whether they were in use simultaneously, whether one replaced the other, or whether this particular slope held some repeated significance across generations.