This one exists primarily as a faint semicircle on a single aerial photograph taken in 1965, invisible to anyone standing in the field above it. What the camera captured that year was a crop-mark, the kind of subtle tonal variation in growing grain or grass that betrays a buried structure beneath the soil, where the ground retains moisture or drains differently along the line of an ancient ditch or bank. That semicircle, visible from altitude but not at ground level, is interpreted as the northern half of what was once a complete circular enclosure near Moycarky in County Tipperary.

The photograph in question, catalogued as CUCAP ALV 60, was taken as part of the Cambridge University Collection of Aerial Photography, a resource that has revealed countless sites across Ireland that left no visible surface trace. The Moycarky enclosure sits on a north-east-facing slope in gently rolling terrain, and it does not stand alone in this landscape. A ringfort, the circular earthen or stone enclosure type most commonly associated with early medieval farmsteads in Ireland, lies to the north-west, and a separate enclosure occupies ground to the south-west. That clustering is itself suggestive; such sites often occur in proximity, reflecting patterns of settlement and land use that persisted over centuries. Whether the Moycarky enclosure shares a period or a function with its neighbours is not established, but its southern half appears to have been lost entirely, probably to centuries of ploughing across the slope.