At Punchestown Great in County Kildare, there is a curious absence where a feature once stood. A long, narrow, steep-sided ridge, estimated at roughly 90 metres along its north-west to south-east axis and about 60 metres across, appeared on the first edition of the Ordnance Survey six-inch map in 1838, labelled simply as a topographical feature with no suggestion that it held any archaeological significance. By the time the revised edition appeared in 1910, it had acquired the name "Punchestown Moat", the word moat here likely carrying the older Irish usage of a raised earthwork or mound rather than a water-filled ditch. Whether the feature was ever genuinely man-made, however, remains uncertain. It may simply have been a natural glacial or geological ridge that later mapmakers, or local tradition, decided to dignify with a name that implied human origin.

That ambiguity was never resolved. When the site was inspected in 1972, it had already been levelled, presumably in the course of agricultural improvement or land clearance. Whatever the ridge had been, natural landform or ancient earthwork, it was gone. The window for investigation had closed before anyone thought to look carefully. The 1838 map remains the clearest record of its shape and orientation, capturing a feature that cartographers of the time saw no reason to flag as an antiquity, and that later generations labelled as something significant only after its character had become harder to read.