This one in Shanballard, in north County Galway, offers something rather different: nothing at all. Whatever once stood on a prominent ridge in open grassland has left no visible surface trace, making it a site defined almost entirely by its own disappearance.

What we know of it comes from cartographic evidence rather than anything you could walk up and touch. The third edition of the Ordnance Survey six-inch map, produced in 1932, records the western half of an irregularly shaped enclosure, oriented roughly north to south across approximately 65 metres, indicated by a single line of hachures. Hachures are the short radiating strokes that Victorian and Edwardian map-makers used to suggest raised ground or earthwork features, a visual shorthand for something that was, at the time of surveying, still legible in the landscape. By the time the site was formally catalogued, that legibility had gone. Whether the earthwork was a field boundary, a ringfort enclosure, or something else entirely, the surviving record does not say, and the ground itself no longer answers the question.