A cashel is a type of ringfort defined by a stone enclosure wall rather than an earthen bank, and this one at Ballylin measures some 24.4 metres in diameter. It is not remarkable for its grandeur but for its gradual erasure, a monument that has spent decades retreating beneath vegetation and accumulated field debris.

When the site was first recorded in 1983, the drystone wall that once formed the enclosure was already heavily overgrown, with the clearest surviving section visible at the northern arc. By the time it was revisited in 2001, the situation had worsened considerably. The monument was entirely obscured, and rubble from field clearance had been piled against the outer face of the wall, particularly on the southern side. This is a fate that has met many cashels across Ireland, structures that were anciently significant as enclosed farmsteads or residences of local landowners, but which, once abandoned, become convenient repositories for stones pulled from surrounding ground during agricultural tidying. The site was noted in McCaffrey's 1952 survey, suggesting it had already attracted some scholarly attention before its condition deteriorated so markedly in the following decades.