The enclosure at Moyle Big exists today as a cropmark, a phenomenon where buried features affect the growth of crops above them, causing subtle differences in colour and height that become legible only in aerial or satellite photography. What appeared clearly in a March 2019 Google Earth image is a circular ditch tracing a near-complete circuit, roughly 57 metres across, with no definitive gap to indicate where an entrance might once have stood.

The ditch itself is not uniform; it widens from around 3.4 metres on the south-eastern side to approximately 5.1 metres toward the south, suggesting either deliberate variation in the original construction or differential preservation over the centuries. Enclosures of this general type are associated across Ireland with a wide range of periods and purposes, from early medieval ringforts used as farmsteads to earlier ceremonial or defensive sites, though without excavation it is impossible to assign Moyle Big to any particular era or function. What gives the site additional interest is its neighbourhood: a church and graveyard at Kellistown East lie roughly 1.75 kilometres to the east-north-east, and less than 800 metres to the west sits a possible large enclosure at Rathcrogue, itself known only as a cropmark. The landscape here, gently rolling and given over largely to farming, may quietly contain several such features, each invisible in the ordinary sense, each waiting for the right season and the right angle of light.