Walk across the flat valley floor where it once stood and there is nothing to indicate you are crossing the boundary of a structure that measured roughly 110 metres north to south and 80 metres east to west, a footprint comfortably larger than a football pitch. The site was levelled at some point after it was mapped, and the ground gives nothing away.

It was recorded twice on Ordnance Survey six-inch maps, first on the 1839 edition and again on the 1947 revision, each time as a large sub-rectangular enclosure sitting in open, cultivated ground with clear sightlines in every direction. Then it vanished, absorbed into the agricultural landscape. What brought it back, briefly, was an aerial photograph taken on 13 July 1989. From the air, the buried outline reappeared as a cropmark, the phenomenon whereby buried walls or ditches affect how overlying crops grow and ripen, producing faint but legible shadows of what lies beneath. That single photograph is now the primary evidence that the enclosure existed at all. Its original purpose and date remain unrecorded; enclosures of this scale in Ireland can relate to early medieval settlement, to ecclesiastical use, or to prehistoric activity, but without excavation the Oldtown example keeps its own counsel.