There is nothing to mark it, no earthwork, no crop of stones, no depression in the turf. The only reason anyone knows it exists is because a camera mounted in an aircraft caught it from above.

A ring-ditch is typically the ghost of a prehistoric burial monument, most often a round barrow or burial mound whose central earthwork has long since been ploughed or eroded flat. What survives is the circular ditch that once surrounded it, and even that survives only as a soil mark or cropmark, a subtle difference in the way grass or grain grows over disturbed ground. Under drought conditions or at certain angles of light, these buried ditches reveal themselves in aerial photographs as faint rings, darker or lighter than the surrounding field. That is exactly how this one came to be recorded, identified on an aerial photograph from a Geological Survey of Ireland series at a scale of one to thirty thousand. The image, roll 54, print 27, caught what ground-level inspection would never reveal.