In a field near Goulyduff in County Kildare, there is nothing visible to the naked eye at ground level, no mound, no hollow, no obvious trace of human activity. Yet from the air, the earth tells a different story. An aerial photograph reveals a cropmark, the ghost of an ancient enclosure pressed into the soil, its circular outline made legible only by the way crops grow fractionally taller or shorter above buried features. What the photograph captured is the plan of a sub-circular enclosure defined by a fosse, a ditch cut into the ground, long since silted and levelled but still detectable as a buried form.

Attached to the northern side of the enclosure is an irregularly subrectangular annexe, a secondary enclosed space that breaks the otherwise rounded outline. This kind of arrangement, a main circular or near-circular enclosure with an attached subsidiary space, is broadly familiar from the Irish archaeological record, where it appears across a range of periods and functions. Circular enclosures defined by a fosse were used variously as ringforts, enclosures for livestock, or more ceremonial spaces, though without excavation it is impossible to assign a specific purpose or date to the Goulyduff example. The irregularity of the annexe's shape suggests it may have been adapted to local terrain or added at a different time from the primary enclosure.