It rises about 1.5 metres at its south-western end, tapers to roughly 0.4 metres at the north-east, and measures around 18 metres across at its widest point. The south-western face has been scarped, meaning cut back at a steep angle, in a way that gives the whole feature a distinctly deliberate, human-made appearance. Mounds of this sort, when genuine, often turn out to be burial cairns, ringfort platforms, or the bases of Norman mottes, the raised earthen mounds on which timber towers were built during the early medieval period. This one, however, is almost certainly none of those things.

The mound sits on a natural rock outcrop in gently rolling countryside, and the current thinking is that what looks like ancient earthworking is largely the result of road construction. A road cuts directly through the southern end of the feature, and it appears that this work involved scarping the natural rock face and levelling the top, producing the tidy, purposeful profile that catches the eye. Crucially, the mound does not appear on the first edition Ordnance Survey six-inch map, the large-scale survey carried out in Ireland during the 1830s, which recorded field monuments with considerable thoroughness. Its absence from that record is one of the stronger arguments against any genuine antiquity. The feature is, as the formal assessment puts it, of doubtful antiquity, a phrase that in archaeological usage means the evidence for a prehistoric or early historic origin simply does not hold up.

What makes the Carney mound worth knowing about is precisely this ambiguity. It is a reminder that the Irish landscape is full of features that read as ancient, that seem to carry the silhouette of human intention, but which turn out on closer inspection to be the product of geology, drainage work, or the unglamorous business of road-making. The scarped rock face and flattened summit are real enough; it is only their meaning that has quietly collapsed under scrutiny.