The circular enclosure, roughly 35 metres across, has been so thoroughly levelled over the centuries that it is largely invisible at ground level. What gives it away is the cropmark, the faint differential in how vegetation grows over buried or disturbed ground, that appeared in an aerial photograph taken in July 1989. In that image, the outline of the fosse, the defensive ditch that would once have ringed the enclosure, and the spread remnants of an internal bank came into focus in a way that no amount of walking the field could reveal.

Ringforts, known in Irish as raths when defined primarily by an earthen bank and ditch, were the most common form of rural settlement in early medieval Ireland, used roughly between the fifth and twelfth centuries as farmsteads for families of some local standing. Thousands survive across the country in varying states of preservation, but many more have been erased by centuries of agriculture, and Boherascrub offers a quiet example of that erasure. The aerial evidence suggests a possible entrance on the east-south-east side, which is a fairly typical orientation for ringforts, thought by some researchers to reflect both practical and ritual preferences around the direction of sunrise. A field fence runs immediately to the west of the site. Roughly 200 metres to the north-west lies a second circular enclosure, a proximity that raises the possibility of associated or sequential occupation in the same townland, though the relationship between the two remains unexplored.