What we know of it comes entirely from a single aerial photograph taken in July 1989, in which the faint arc of buried ditches showed up as a cropmark, the kind of subtle discolouration in growing crops that reveals underground features invisible at ground level. The image captured what appears to be three concentric fosses, or ditches, forming a circular enclosure roughly 50 metres across at its outermost ring and about 25 metres across at its innermost. The eastern side has been cut away by a field boundary, so the full circuit was already broken before anyone thought to look.

The spacing of the inner and middle ditches is notably wide, which sets this enclosure apart from the more compact ringforts, the single-ditched farmstead enclosures common across early medieval Ireland, that punctuate the Irish countryside in their thousands. Triple-ditched enclosures of this kind are far rarer and are sometimes associated with higher-status or ceremonial use, though without excavation it is impossible to say more with confidence. What makes the site at Cregg more striking still is its immediate neighbourhood. Roughly 100 metres to the north-west, four ring-ditches sit in a roughly linear arrangement in the same field. Ring-ditches are typically the ploughed-flat remnants of Bronze Age burial mounds, their central mound long gone but the encircling ditch still legible from the air. A ringfort lies about 150 metres to the north-west in the same field. The concentration of features here, spanning potentially thousands of years of activity, suggests this particular patch of north Cork was returned to, built upon, and perhaps venerated across multiple generations and cultures.