It leaves no upstanding wall, no visible earthwork, no obvious mark on the landscape. Its existence is known almost entirely because, on a dry summer's day in 1989, an aircraft passed overhead at the right moment.

The enclosure announced itself through a cropmark, the phenomenon by which buried ditches and foundations cause the vegetation above them to grow differently, in ways that become legible only from the air. The fosse, meaning the enclosing ditch, shows up as a trapezoidal outline roughly 30 metres across on its north to south axis, with rounded corners rather than sharp angles. At some point the soil inside the enclosure was disturbed or compressed differently in one area, producing what is recorded as a macula, a patch or stain in the crop that sits slightly off-centre towards the east. What that feature represents, whether a building, a pit, or some other internal structure, is not recorded. The aerial photograph capturing all of this was taken as part of a survey in July 1989. Adding further interest, two further enclosures lie roughly 50 metres to the north, suggesting this part of north Cork was once a more densely organised landscape than it appears today.