It has no visible earthwork, no stone, no depression in the soil. Its entire existence rests on a single aerial photograph, in which a faint circular or oval shadow in a crop betrayed something buried beneath the surface.

Crop-marks appear when buried features, walls, ditches, or pits, affect how plants grow above them. Soil disturbed by an ancient ditch retains more moisture and produces lusher, taller crops; a buried wall does the opposite. From the air, and only under the right conditions of drought and low sun, these differences in growth become visible as ghostly outlines. The enclosure at Aughris was identified in exactly this way, recorded in an aerial photograph and formally listed in the Record of Monuments and Places in 1995. It measures somewhere between ten and fifteen metres at its widest, making it a small feature, roughly the size of a large room. It never appeared on any edition of the Ordnance Survey six-inch map, suggesting it had already vanished from the landscape entirely before systematic mapping of the Irish countryside began in the nineteenth century.