Stone rows are among the more enigmatic survivals of prehistoric Ireland, and the one at Knockanaffrin in County Waterford is notable less for its scale than for the quiet precision of its modesty. The entire alignment stretches just 3.45 metres, composed of three upright stones arranged in a north-south line at the crest of a south-facing slope. It is, by any measure, a miniature, yet it was clearly placed with deliberate intent, positioned to overlook the Nier river some 800 metres to the south.

The three stones vary slightly in form. The southernmost is rectangular, standing 0.6 metres high; the central stone is subcircular, a little shorter at 0.53 metres; and the northernmost, also rectangular, is the smallest of the three at 0.45 metres. The spacing between them is uneven, 1.45 metres separating the southern and central stones, and 0.7 metres between the central and northern ones, which gives the row a slightly compressed feel toward its upper end. Stone rows of this type, in which a small number of standing stones are set out in a line, appear throughout Munster and are generally assigned to the Bronze Age, though pinning down precise dates or purposes remains difficult. Whether they served as territorial markers, ritual focal points, or something else entirely, the Knockanaffrin example sits within an ancient field system, suggesting it existed alongside, and perhaps in relation to, a working agricultural landscape rather than in isolation from it.