At Lisgub in County Galway, a byroad running roughly northeast to southwest cuts straight through what was once, by all appearances, a subcircular enclosure. Everything to the east of that road has vanished from the surface entirely, leaving only the western arc to suggest that something deliberate was once laid out here across the undulating grassland.

What survives on the western side is a low bank, no more than 0.6 metres high and about 1.2 metres wide, curving from the southwest around to the west. It is overgrown with whitethorn, which has a way of colonising and partly preserving old earthworks while also obscuring them, and there are faint traces of a fosse, a shallow external ditch of the kind typically dug to reinforce an enclosing bank, running along its outer edge. The form is consistent with a ringfort or enclosure, the kind of roughly circular embanked settlement that was common across Ireland from the early medieval period onward, though the site carries the careful qualifier of being "possibly a landscape feature" rather than a confirmed archaeological monument. It first appears mapped as a curving field boundary on the third edition of the Ordnance Survey six-inch map, dated 1933, by which point it was likely already half-forgotten and absorbed into the working geometry of the fields around it.