It measures twenty-eight metres across and rises only twenty centimetres above the surrounding grass, a bank so slight that a person walking through the field might cross it without noticing. What gives it away, if anything does, is the aerial view, where the faint arc of its outline resolves into a deliberate, man-made shape against the flat terrain of Garryduff.

The site was identified from an aerial photograph, the kind of oblique or vertical image that has transformed our understanding of the Irish countryside by revealing cropmarks and earthworks invisible at ground level. The enclosure is circular in plan, defined by that barely perceptible raised bank, and its function remains unspecified. Circular enclosures of this kind are a broad category in Irish archaeology, encompassing everything from early medieval farmsteads to stock enclosures to features with possible ritual associations, and without excavation it is rarely possible to say which a given example represents. What makes the Garryduff site particularly interesting is its relationship to a neighbouring ringfort, a type of enclosed settlement common in early medieval Ireland, typically consisting of a circular area bounded by an earthen bank and ditch. That ringfort sits roughly thirty metres to the south-east, close enough to suggest the two features may have been part of the same agricultural or domestic landscape, though whether they were contemporary is unknown.