Roughly twenty metres across, it exists most clearly as a cropmark, a phenomenon where buried archaeological features cause the vegetation above them to grow at slightly different rates, producing patterns that only become legible from the air. A 1973 aerial photograph captured it in the rough, undulating pasture of Shrone More, but at ground level the enclosure offers nothing to the eye.

Cropmarks of this kind often indicate the filled-in ditches or collapsed walls of ancient enclosures, which were among the most common features of the early Irish landscape. Circular enclosures, sometimes called ringforts or raths when their earthworks survive above ground, served variously as farmsteads, defended homesteads, or enclosures for livestock, typically during the early medieval period. At Shrone More, whatever structure or activity once defined this particular circle has left no upstanding trace. The site sits within a wider landscape that includes views south towards The Paps of Dana, the twin rounded hills in the Derrynasaggart Mountains that take their name from the Irish goddess Danu and have long carried a mythological weight in the region.

The enclosure is, in a practical sense, invisible to a visitor on foot. Its existence is a reminder that a great deal of Irish archaeology is known only through aerial survey, legible to cameras but not to people walking the ground above it.