In a stretch of gently undulating improved pasture at Ballynagrana in County Tipperary, a roughly circular enclosure measuring around six metres in diameter exists, in any practical sense, only in a single aerial photograph. At ground level, there is nothing to see at all.

A ring-ditch is generally understood to be the buried remains of a circular ditch, often the only surviving trace of a prehistoric burial mound whose earthen fabric has been ploughed or eroded away over centuries. The circular crop or soil mark they leave behind is frequently the sole evidence that something once stood there. This particular example never appeared on any edition of the Ordnance Survey six-inch maps, suggesting it was either already levelled or too subtle to register by the time systematic surveying began in the nineteenth century. It came to light only through aerial photography, referenced as OSI 2436/5, which captured it as a faint circular mark in the soil. Notably, it does not stand alone: at least two further ring-ditches have been identified nearby, and a mound sits roughly sixty metres to the east, hinting that this corner of Tipperary was once a place of some significance in the prehistoric landscape, even if that significance left almost nothing above ground.