It only reveals itself from the air, showing up as a cropmark, a phenomenon where buried ditches and banks cause the vegetation above them to grow differently, producing faint variations in colour and height that become legible from altitude. The enclosure is roughly 45 metres in diameter and defined by a fosse, a defensive or boundary ditch, though the cropmark suggests the circuit was never fully completed, or at least that part of it has been lost entirely.

What makes Rathlogan particularly interesting is the company this enclosure keeps. Within about 170 metres to the north-west sits a ringfort, the kind of enclosed farmstead that was common across early medieval Ireland, typically surrounded by an earthen bank and ditch. A further 140 metres or so to the north-north-west, a medieval church and its associated graveyard occupy the same small stretch of landscape. The clustering of an enclosure, a ringfort, and a church within such a compact area suggests this corner of Kilkenny was a meaningful place across several centuries, though exactly how these features related to one another, whether they were contemporary, successive, or simply neighbours across time, is not something the aerial record alone can answer.