What marks it out is the manner of its discovery: aerial reconnaissance carried out in November 1987 caught a barely perceptible rise in the terrain, the kind of feature that registers as a shadow or a subtle change in tone from altitude, and means almost nothing to someone walking past it.

Enclosures of this general type, roughly circular earthworks that once defined a farmstead, a ceremonial space, or a place of shelter, are common across Ireland, though most survive in far better condition than this one. Here, the defining feature is described as a slight rise, which suggests centuries of ploughing, grazing, and weathering have worn the original bank almost entirely flat. The 1987 reconnaissance was part of a broader aerial survey programme, and the Ballymore site was logged among the results, a faint outline preserved more in the photographic record than in the land itself.