A rath, the Irish term for a ringfort, was typically a circular earthen enclosure used as a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. Thousands once dotted the Irish countryside, and thousands have since been ploughed, built over, or simply worn away. The one at Boherascrub has suffered a similar fate, levelled to the point where it reads now as little more than a shallow saucer in a grazing pasture on a north-facing slope.

What makes the site quietly worth attention is the consistency with which it was recorded. Ordnance Survey maps from 1842, 1905, and 1937 each show it as a hachured circular enclosure, roughly 28 metres in diameter, which gives some sense of how legible it once was on the landscape. By the time of more recent survey, the bank had been reduced to a low scarp no more than 25 centimetres high, and the external fosse, a defensive ditch that would originally have ringed the outside of the enclosure, survives only as a faint shallow depression. An entrance around five metres wide faces north, which is an unusually clear detail to have endured given how little else remains above ground.