The enclosure is classified as a ringfort, one of the most common monument types in the Irish landscape, but something about this one gives archaeologists pause: the bank is unusually rich in stone beneath its grassy covering, which raises the possibility that it is in fact a cashel, the term used for a ringfort whose boundary was originally a dry-stone wall rather than an earthen bank. The distinction matters because cashels are more typically associated with the west of Ireland and with upland or rocky terrain, making a potential example here, buried under sod and abutting a later castle, a quietly interesting outlier.

The structure sits directly alongside the bawn of Castlepook Castle, a bawn being the fortified enclosure or courtyard wall that typically surrounded an Irish tower house or castle complex. The physical relationship between the two is suggestive: the ringfort or cashel predates the medieval castle, and the castle's builders appear to have constructed their bawn wall right up against the earlier enclosure rather than clearing it away. Whether that adjacency was deliberate, making use of the existing boundary, or simply a matter of working around an obstacle that was too substantial to remove, is not recorded. What remains is a layered arrangement of two different periods of defended settlement occupying essentially the same footprint, each leaving its mark on the other.