The one at Bullaun in County Galway is a modest example, and a quietly puzzling one. Measuring some 44 metres in diameter, it sits roughly 30 metres south-east of a neighbouring ringfort, which raises the possibility that the two structures were related, perhaps functioning together as part of the same agricultural or residential complex. That pairing is the most interesting thing about it, because the cashel itself has not fared especially well over the centuries.

What survives is a poorly preserved circuit of drystone walling, and even that is incomplete. A field wall, probably laid out at some later point when the land was reorganised for farming, cuts across the monument at both the south-east and south-west. South of that wall, no visible trace of the cashel remains at ground level, the original structure absorbed or obscured by later use of the land. It is a common enough fate for early medieval sites in the west of Ireland, where stone was a practical resource and old walls were routinely robbed out or incorporated into newer ones. The result here is a monument that is more legible on paper than it is underfoot.