The ground steps down in two distinct terraces, forming a sub-oval shape roughly 25 metres across, and yet there is no wall, no ditch, no fence line to explain why. This is the enclosure at Barnakyle, and its defining feature is, in a sense, its refusal to be easily defined.

What survives here is a pair of scarped edges, meaning the ground has been deliberately cut or shaped to create abrupt, sloping drops rather than raised banks. The inner edge stands around 0.8 metres high and spans about 6.25 metres in width; the outer edge, running from the north to the southeast, is slightly lower at 0.7 metres and somewhat narrower at 5.3 metres. Together they give the earthwork what the survey compiled by Denis Power in 2013 describes as a stepped appearance. Beyond this northern and southeastern arc, however, there is no evident enclosing element at all. The interior surface is uneven and slopes gently down toward the southeast, all of it under pasture. Whether this represents a ringfort, a univallate enclosure of early medieval date, or something else entirely is not stated in the record, and that ambiguity is part of what makes it worth noticing. Ringforts, the most common enclosure type in the Irish landscape, typically rely on a raised bank and external fosse, or ditch, to define their boundary; this site works differently, using negative cuts rather than positive banks as its primary surviving form.

Barnakyle lies in undulating pasture immediately south of a field boundary, which means the enclosure sits within a working agricultural landscape where earthworks can be easy to miss or to misread as natural variation in the ground. The uneven interior and the grassed-over scarps will not announce themselves dramatically. Visiting in late autumn or winter, when low-angle light rakes across the field surface, gives the best chance of reading the stepped profile that distinguishes this site from its surroundings.