The one at Knocknaneirk, sitting in flat pasture on the northern side of the Bride River valley in County Cork, is an exception. Only seven of what may have originally been nine stones still stand, arranged along the northern perimeter in a partial arc, as though the southern half of the circle simply never arrived. What remains is enough to read the structure's intentions: the seven upright orthostats include what appears to be the axial stone and the two entrance stones, which in Cork's prehistoric multiple-stone circles typically define an alignment and give the monument its orientation. Here that axis runs northeast to southwest, spanning an internal measurement of 9.8 metres.

The site was documented in detail by Seán Ó Nualláin, whose 1984 survey of Cork's stone circles remains a key reference for this class of monument. The orthostats themselves are modest in scale, ranging from 0.8 to 1.4 metres in height and 0.4 to 0.8 metres in thickness, with lengths between 0.9 and 1.5 metres. In Cork's multiple-stone circles, the axial stone is usually the lowest and most deliberately placed of the uprights, positioned opposite the entrance pair and lying along the monument's principal axis; its inclusion here, even in a damaged circle, suggests the original design followed the regional template closely. Whether the missing stones were removed, robbed for later building, or simply never erected is not known.