At Rosslague, on the crest of a ridge in County Cork, a ringfort, or rath, once occupied the high ground in the way these circular earthwork enclosures typically did across early medieval Ireland, commanding a view of the surrounding landscape and probably sheltering a farmstead within their banks. Today there is no visible surface trace of it whatsoever. The land has been turned over to tillage, and the ridge gives nothing away.

The site was documented on the 1842 Ordnance Survey six-inch map as a circular enclosure of roughly 35 metres in diameter, which is a fairly typical size for a rath of this kind. By the time Patrick Power wrote about the area in 1923, citing earlier Ordnance Memoir records, three small lios, the Irish word for a ringfort enclosure, had already been levelled in the locality. Power noted that while all three had been flattened, their sites were still easily recognised at that time. Since then, the agricultural transformation of the land has erased whatever traces remained. The enclosure at Rosslague now exists only in the cartographic record and in that brief nineteenth-century notation, a site that survived for perhaps a thousand years before disappearing within a century of being properly mapped.