This cashel in Rannagh, on the Burren fringe of County Clare, is the angular exception. A cashel is a ringfort built in stone rather than banked earth, and this one would originally have enclosed a roughly rectangular space measuring around 25 metres north to south and 20 metres east to west. What survives today is only the south-east corner, a partial ruin on a semi-karst plateau of rough pasture, with a cliff dropping away approximately 70 metres to the west and the widest open views sweeping from south-west to north-east across the limestone landscape.

The remains are modest but legible if you know what you are looking for. The southern part of the east wall is the most intact section, with associated collapse giving a combined spread of about 3 metres, and the outer wall-face still visible intermittently at around 0.6 metres high. The eastern end of the south wall, between 1.9 and 2 metres thick, retains some low traces of its inner wall-face and a stretch of well-built outer facing in rough limestone flags, standing between 0.45 and 1.4 metres high. At the north and west sides, only a very vague scarp marks where walls once ran, and a later field wall has been built directly over this trace, the kind of quiet overwriting that happens across centuries of continuous agricultural use. The cashel sits within what survives as an extensive multi-period field system, suggesting that farming activity here long predates and long postdates whoever once occupied the enclosure itself. The limestone flags used in the outer facing are the local Burren material, the same pale grey stone that underlies the whole plateau and shapes everything built on it.