The one at Aghanahil, in County Galway, is the exception. Sitting in level grassland, it has largely dissolved back into the earth, leaving only a ghost of what was once a substantial enclosed settlement.

What survives is the eastern arc of a bank, and traces of an external fosse, the shallow ditch dug to throw up the bank material in the first place. The overall footprint is large, roughly 60 metres across on a north-south axis, which suggests this was once a significant rath. A rath is the most common form of early medieval enclosure in Ireland, typically a circular or subcircular earthwork surrounding a farmstead or the residence of a local lord, dating broadly from the fifth to the twelfth centuries. At Aghanahil, the rest of the circuit has been reduced to almost nothing, whether by centuries of ploughing, grazing, or simple erosion across the flat ground. What would once have read as a clear ring in the turf is now best understood as a large subcircular outline, poorly preserved and easy to overlook.

There is little in the way of visitor infrastructure here, and the site itself rewards patience more than spectacle. The surviving bank fragment to the east is the most legible feature on the ground, and understanding the scale of the original enclosure requires some mental reconstruction across the surrounding grassland.