A circular enclosure, the kind of earthwork that in Ireland often marks the footprint of a ringfort or early medieval settlement, was recorded here on the first edition Ordnance Survey six-inch map, produced in the nineteenth century. Today, standing on the flat pasture where it should be, there is nothing to see. The enclosure has vanished from the ground entirely.

The first edition OS six-inch maps, surveyed in the 1830s and 1840s, captured the Irish landscape at a moment before large-scale agricultural improvement had erased many of its older features. Earthworks that were faint even then were recorded with reasonable diligence, making these maps an invaluable archive of sites that subsequent ploughing, drainage, and land reclamation have since destroyed or buried. The Tullahedy enclosure falls into that category of places known only through historical mapping, its circular outline preserved on paper long after the soil has been levelled and turned over. Whether it was a ringfort, a enclosure of some other function, or simply a field boundary of unusual regularity, the notes do not say.