It survives only as a memory in the soil, revealed briefly after ploughing when burnt material appears on the southern side of a well. No mound, no hollow, no visible trace remains otherwise.

The site belongs to a class of monument known as a fulacht fia, a term for the horseshoe-shaped mounds of fire-cracked stone that appear in considerable numbers across the Irish countryside, particularly in low-lying or waterside ground. The typical interpretation is that these were outdoor cooking places used during the Bronze Age, where stones were heated in a fire and then dropped into a water-filled trough to bring it to a boil. Over time, the shattered, heat-spent stones were raked out and piled up, forming the distinctive crescent-shaped mound that survives at better-preserved examples. At Mashanaglass, that accumulated debris has been reduced, through centuries of cultivation and disturbance, to an occasional scorch of dark material in a ploughed furrow. The association with the well is consistent with what archaeologists observe more broadly: fulachta fia almost always sit close to a water source, which was essential to how they functioned.