It is, in fact, a cashel, roughly thirty metres across, and what makes it worth pausing over is precisely how much it has dissolved back into the landscape. A cashel is a ringfort built from dry stone rather than earthen banks, a form of enclosed farmstead used in early medieval Ireland, typically between the sixth and tenth centuries. At Bredagh, the circular outline is still just legible, but the wall that once defined it has long since collapsed inward and outward, leaving a low, rubbled trace rather than any upstanding masonry.

The site survives in level grassland, and its deterioration appears to have been compounded by the common practice of using a convenient ancient wall as a source of cleared field stone. The outer face of the cashel wall is obscured by what looks to be exactly that, field-clearance rubble piled against it over generations of agricultural tidying. The inner wall-face fares somewhat better in places, though it has disappeared entirely along the stretch running from north-northwest to north-northeast. One feature resists easy explanation: a gap on the eastern side, which may be an original entrance rather than a later breach. Entrances to cashels were commonly positioned to face east or southeast, so the possibility is plausible, though at Bredagh the evidence is too worn to say with any confidence.