Only one still stands upright; the others have fallen, their considerable lengths now flush with the ground, and the whole arrangement stretches across roughly 8.8 metres of boggy terrain. It is the kind of site that rewards a second look, because what appears at first to be random stonework resolves, on inspection, into something deliberate.

The alignment is classed as a probable stone row, a type of prehistoric monument found across Munster in particular, typically comprising between two and six standing stones set in a line. At Knocknagappul the row appears to consist of three stones arranged roughly along a northeast to southwest axis. The single erect stone at the northern end stands 2.5 metres high, making it a substantial presence on the saddle; its long axis follows the NE-SW alignment of the row as a whole. Three metres to the southwest lies a prostrate slab measuring over 2 metres in length, and a third stone lies a further 3 metres beyond that, the longest of the group at 4.1 metres. A separate slab lies beside the standing stone but its relationship to the row is uncertain; it may simply be unconnected. The site was catalogued by Seán Ó Nualláin in 1988, whose systematic survey of stone rows across the south of Ireland brought many such overlooked alignments into the archaeological record for the first time.

The bog setting adds a layer of interpretive difficulty that is common to monuments of this type. Peat growth and cutting can shift, obscure, or partially preserve stones, and the two prostrate slabs here may have toppled over centuries or may never have stood at all. The overall picture remains tentative, which is part of what makes the site genuinely interesting rather than merely scenic.