The distinction matters: a recumbent stone, one lying flat on the ground rather than upright, occupies an ambiguous space between deliberate placement and slow collapse, and in this case it is not entirely clear which applies. What is clear is that the stone does not sit in isolation but within the earthwork of a ringfort, a type of enclosed farmstead typical of early medieval Ireland, usually consisting of a circular bank and ditch. The combination of the two features in one spot gives Knocknagappul a quietly layered quality.

The stone itself is sub-rectangular in shape, measuring roughly 1.3 metres by 0.6 metres and standing, or rather lying, at a height of 0.86 metres. Its orientation follows a WNW to ESE axis, a detail that may or may not be significant; many standing stones across Ireland show deliberate solar or lunar alignments, though whether that applies here is not recorded. Its position inside the northern bank of the adjoining ringfort raises the question of sequence, whether the stone predates the earthwork and was simply enclosed by it, or whether the two were always conceived as part of the same site. That question remains open.