The rock outcrop itself measures roughly 28 metres north to south and 32 metres east to west, and whoever chose to enclose it took full advantage of what the landscape had already provided: streams running along the eastern and southern sides do much of the boundary work without any human effort at all.

An enclosure of this kind is essentially a defined and defended space, its perimeter formed by a combination of earthwork and stonework rather than a single uniform wall, and the one at Neaskin demonstrates a fairly typical mixture of techniques applied with some care. Along the south-western to northern arc, a partially stone-faced earthen bank survives to about half a metre in height. Moving round to the north-east, the construction shifts: a stone-faced scarp, slightly taller at 0.7 metres, carries a stone-built wall on top of it, adding a further 0.6 metres. To the west, where the streams no longer provide a natural barrier, there is an external fosse, a cut ditch roughly 0.4 metres deep, reinforcing the enclosure on its most exposed side. The result is a perimeter that reads almost as a hierarchy of effort, with the most labour-intensive work concentrated where the terrain offered the least natural protection.

The interior, rising to the top of the hillock with some bare rock still breaking through, is now largely given over to gorse. That overgrowth makes close inspection difficult, but it also means the site sits largely undisturbed, its low banks and scarp still legible in the landscape for anyone willing to pick their way through the marsh and the scrub to find it.