Only from the air does it resolve into something legible: a small circular enclosure, the kind of subtle earthwork that centuries of ploughing, grazing, and weather have pressed almost flat into the landscape.

What aerial photography reveals here is a ring-ditch, a term for a roughly circular trench or buried ditch whose outline survives as a crop mark or soil mark rather than as upstanding masonry or earthen banks. Ring-ditches are often the last traces of prehistoric funerary or ceremonial monuments, the ditches that once surrounded burial mounds long since levelled. The enclosure at Killiniskyduff was captured in photographs taken by Michael Moore on 16 July 2006, a date that matters because summer, when crops are ripening and moisture differences in the soil affect plant growth at different rates, is precisely when these buried features tend to show themselves most clearly from above. The dry season draws out contrasts that rain and cloud suppress for the rest of the year.