It casts no shadow, rises to no bank, and leaves no obvious mark on the surface. The only evidence of its existence is a single aerial photograph, taken in 1974, which caught whatever subtle variation in soil moisture, crop growth, or ground tone was enough to betray a buried outline that centuries of farming had otherwise erased.

Enclosures of this kind, typically circular or sub-circular ditched boundaries associated with early medieval settlement or agricultural activity, are a familiar feature of the Irish countryside, though most survive at least partially above ground as earthworks. The one at Lisnagaul is more thoroughly lost than most. The 1974 photograph, catalogued under the Geological Survey of Ireland reference R.507/8, remains the sole record of its form. A slight linear depression running roughly north-west to south-east along the western quadrant of the enclosure may represent a drainage feature, and it is just about detectable on the ground, but that faint hollow is the only physical trace. The enclosure itself is invisible at ground level, absorbed into the level terrain of the glen.