This is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically associated with the Bronze Age. The standard interpretation holds that water was heated by dropping fire-heated stones into a trough; the shattered, heat-spent stones were then discarded to form the characteristic curved mound that survives. The example at Knockanroe measures fifteen metres long, eleven metres wide, and still stands roughly eighty centimetres above the surrounding ground, despite being partially levelled at some point. Its opening, about four metres wide, faces north-west.

What makes the site quietly interesting is its immediate context. A spring rises just to the north-north-east, which would have supplied the water essential to the whole process, and another fulacht fia lies only forty-four metres to the south-east. The proximity of two such sites, both drawing on the same wet, marshy ground, suggests this was not an incidental or one-off use of the landscape. Whether the two mounds represent broadly contemporary activity or successive episodes of use across generations, the clustering points to a place that held some practical or perhaps social significance over time. Marshy, spring-fed ground was not accidental to the fulacht fia tradition; it was the point.