A cashel is a ringfort built from dry-laid stone rather than earthen banks, typically dating from the early medieval period and used as a defended farmstead enclosure. This one measures roughly 33 metres in diameter, but its defining wall has been overlain at every point by a later field wall, and several field boundaries radiate outward from the monument itself, as though the surrounding farmland has been quietly organised around it for generations without anyone pausing to mark the distinction.

That layering tells its own story. Across Ireland, early medieval cashels were frequently reused, robbed for stone, or simply incorporated into field systems as land was divided and redivided over centuries. Here, that process has been so complete that the structure is described as very poorly preserved, its original form legible mainly in the circular outline that the later wall happens to follow. A second enclosure lies some 80 metres to the north, suggesting this part of Glennagarraun once supported more than one such settlement, though the relationship between the two is not recorded.