The feature is so subtle, at only about thirty centimetres above the surrounding field, that a person walking across it might not register it at all. Yet the geometry is deliberate and ancient: a roughly circular area measuring around thirty-four and a half metres north to south and thirty-three metres east to west, its interior bowl sloping gently inward from the low earthen bank that defines it.

This is a rath, the most common monument type in the Irish landscape. Raths, sometimes called ringforts, were enclosed farmsteads of the early medieval period, roughly the fifth to twelfth centuries, built and occupied by farming families of varying social rank. The enclosing bank and ditch provided a degree of security for livestock as much as for people, and the interior would have held timber buildings, working areas, and the daily apparatus of rural life. The Boherascrub example is a double-banked form, meaning it originally had two concentric earthen rings rather than one, a feature that generally indicates a household of somewhat higher status. The 1842 Ordnance Survey six-inch map records both rings as a double broken line, with roughly eight metres of separation between them, which suggests that even by the mid-nineteenth century the monument had suffered some erosion but remained legible to the surveyors. Its position on a gentle north-north-westward-facing slope in what is now open pasture is typical of the way such sites were placed across the Cork landscape, favoured ground that balanced drainage, outlook, and access to agricultural land.