It is the kind of feature that registers more clearly from the air than from the ground, the kind that walkers might step over without a second thought, mistaking it for a natural rise in the terrain.

The enclosure at Kilbeg belongs to a broad class of circular earthworks found throughout Ireland, commonly interpreted as the remains of a ringfort, a type of enclosed farmstead that was widespread during the early medieval period, roughly the fifth to the twelfth centuries. A ringfort typically consisted of a raised bank, sometimes reinforced with stone, surrounding a domestic space where a family and their livestock would have sheltered. The defining bank here is described as low, which suggests centuries of natural erosion and, quite possibly, the disturbance that comes with planting and harvesting commercial timber. The site came to wider attention through aerial photography, which has long been one of the most reliable ways of detecting earthworks that have been flattened or obscured at ground level, crop marks and shadow effects revealing what the eye on foot cannot easily see.