A cashel is a ringfort built of dry-stone walling rather than earthen banks, and this one at Ballyganner measures roughly 26 metres north to south and 24.5 metres east to west internally, placing it comfortably within the range typical of early medieval enclosures used for settlement and the protection of livestock. What makes it quietly notable is not just its survival but its context: it sits within a large, multi-period field system that speaks to centuries of continuous land use across this stretch of the Burren, and another cashel of similar type lies only about 35 metres to the north-west, the two structures close enough to suggest a community or estate that once organised itself deliberately across this high ground.

The wall itself, though overgrown, retains a facing on both its inner and outer sides, built from large horizontally laid stones, some over a metre in length. It survives to between half a metre and one and a half metres in height, and at its widest reaches 2.3 metres across, suggesting an originally substantial barrier. The cashel appears on both the 1842 and 1920 editions of the Ordnance Survey six-inch maps, marked with hachures indicating an upstanding earthwork, which confirms it was a visible and recorded presence in the landscape for at least the better part of two centuries. A five-metre gap now breaks the south-western arc of the wall, and this appears to have been made by machinery rather than the slow attrition of time or stone-robbing, a jarring intrusion into what is otherwise a remarkably coherent survival. The ground drops steeply to the south-south-east, falling as much as ten metres over roughly 35 metres, so the site would have commanded a clear outlook in that direction, a consideration that was unlikely to have been incidental to whoever chose to build here.