It runs roughly thirty metres from north to south, half a metre wide and never quite reaching knee height, and it has no obvious gate, no accompanying ditch, and no surviving twin to suggest the boundaries of a field that might once have made sense of it. What it does have is a particular persistence, sitting in a drier patch of otherwise wet and rough grazing, anchored at its northern end against a natural rock face and ending, at the south, at the lip of a drop to a lower terrace.

A relict field boundary is, in the most straightforward terms, the remains of a division that people once imposed on land they were actively farming or managing. When cultivation retreated from marginal upland ground, as it did repeatedly across Ireland during periods of famine, depopulation, or agricultural change, walls and banks like this one were left behind. The bog crept in, the turf built up, and what had been a working boundary became something half-buried and half-forgotten. At Shehy Beg, the stones rising from beneath the turf suggest the boundary has been covered gradually over time rather than dismantled. Tony Miller, who recorded the feature in December 2014, noted that the surrounding land is otherwise boggy rough grazing, which makes the drier strip where the boundary sits all the more legible as a trace of former human activity.