It exists, in any meaningful sense, only in a single aerial photograph, its shape inferred from shadows, crop marks, and the tell-tale kink of a since-removed field boundary.

The site was identified from an Air Corps aerial photograph, reference V. 312/3077-6, as a possible bivallate enclosure, meaning a roughly circular or oval settlement defined by two concentric banks and ditches rather than one. Such enclosures are broadly related to the ringfort tradition of early medieval Ireland, defended farmsteads whose earthworks could range from modest single banks to more elaborate doubled circuits. At Garryduff, only the north-east to east sector reads clearly on the photograph. The southern quadrant is suggested more tentatively, its curve hinted at by an angular deviation in a field boundary that once ran north-east to south-west across that part of the hill. That boundary has since been removed entirely, and with it the last visible trace at ground level. Approximately 150 metres to the south-west, a separate ringfort survives, which gives some sense of the kind of settled landscape this slope once formed part of.

What makes the Garryduff enclosure quietly strange is precisely this condition of near-total erasure. The archaeology was not excavated, not quarried away, not built over. It was farmed into invisibility, the earthworks gradually levelled until a photograph taken from altitude became the sole record of something that people once lived within or used. The field boundary that briefly preserved the southern arc is itself now gone, leaving the site to exist only as a set of coordinates on a slope of ordinary pastureland.