One of these is a fractured sandstone outcrop whose decorated face looks out to the south-west, carrying a cup-and-ring mark and a single cupmark, both now faint and shallow against the rough stone. Cup-and-ring marks are among the most common forms of prehistoric rock art found across Ireland and Britain: a central depression, or cup, surrounded by one or more concentric carved rings, cut into exposed rock surfaces, almost certainly during the Bronze Age, though their precise purpose remains unknown.

The cluster at Derrynablaha occupies a compact area of hillside, roughly sixteen metres by eight, at around 248 metres above sea level, overlooking the Kealduff River valley. The particular stone in question is modest in scale, the decorated surface measuring approximately 1.35 metres by 1.5 metres, and sits only 35 centimetres proud of the surrounding ground. Its cup-and-ring mark is about 13 centimetres in diameter, but the ring itself does not complete a full circuit; a natural fracture line running roughly east-north-east to west-south-west breaks across the southern portion of the carving, so what survives is already compromised by the stone's own geology. An earlier record by Finlay in 1973 noted two cupmarks on this stone, but more recent examination suggests the second apparent mark is likely a natural dimple in the rock rather than a deliberate carving, a small reminder of how difficult it can be to distinguish human handiwork from the accidents of weathered sandstone. A second carved stone lies just 4.5 metres to the north-east, and Lough Brin sits to the east of the site.