To an untrained eye it might read as nothing more than a boggy hummock, but it is the remains of a fulacht fia, a type of prehistoric cooking site found across Ireland in considerable numbers. The typical fulacht fia consists of a horseshoe-shaped mound of fire-cracked stones discarded beside a trough, into which water was poured and heated by dropping in stones from a nearby fire. They are found most often in low-lying, wet ground close to water, and this example at Knockane fits that pattern precisely.

What gives this particular site a small additional layer of curiosity is a cartographic puzzle. The 1937 Ordnance Survey six-inch map labels the location using the plural form, 'fulachta fiadh', suggesting that two such monuments were once recorded or expected here. However, only one mound has been identified on the ground, and the plural designation is now thought to have been made in error. Whether a second feature was misread from an earlier source, or whether it simply was never there, is unclear. It is a reminder that historic maps, for all their value, were sometimes working from incomplete or second-hand information, and that a name on paper does not always correspond to something solid beneath the grass.