It has no upstanding remains, no marker, and no physical presence at ground level whatsoever. What it does have is a shadow, or something close to one: a cropmark, the faint differential in how crops grow over buried soil, that briefly gave it away to a camera mounted in an aircraft passing overhead in the summer of 1968.

The feature is a ring-ditch, a type of monument consisting of a circular fosse, or ditch, typically enclosing a central area and associated in Irish archaeology with Bronze Age funerary or ceremonial use. This particular example measures approximately fifteen metres in diameter. It was identified from an aerial photograph taken on 15 July 1968 as part of the Cambridge University Collection of Aerial Photography, a survey programme that caught many such features across Ireland and Britain during decades when they might otherwise have gone entirely unrecorded. Cropmarks like this one appear when buried ditches, which retain more moisture than the surrounding subsoil, cause the vegetation above them to grow fractionally taller or greener, a difference that becomes legible only from altitude and only under the right atmospheric conditions. A second, larger possible enclosure sits immediately to the south-southwest of this one, suggesting the area around Boheragaddy may have held more prehistoric significance than the unbroken fields there now imply.