It is the kind of feature that passes unnoticed at ground level but becomes legible only from above, where its geometry betrays a deliberate, human origin.

The enclosure came to light around 1996, when the Ordnance Survey Ireland air survey branch was preparing the 1:50,000 map series and systematically photographing the country from the air. Analysts working from those images identified it as a ringfort-type enclosure. Ringforts, known in Irish as raths or lios, are among the most common archaeological monuments in Ireland, typically dating from the early medieval period, roughly 500 to 1000 AD. They were built as enclosed farmsteads, with an earthen bank and ditch protecting a household and its livestock. Whether this example at Ballynure functioned in precisely that way is unknown; the classification is tentative, based solely on its circular form and dimensions as seen from the air.