No earthwork rises from the ground; instead, the feature declares itself from the air, where differences in crop growth betray the buried line of a fosse, a defensive ditch, beneath. Aerial photographs taken in August 1996 caught this cropmark clearly enough to allow the enclosure to be recorded and measured, but on the ground there is, for all practical purposes, nothing to see.

The site sits roughly 590 metres south-west of a place called Highrath, a name that appears on the first edition Ordnance Survey six-inch map, was still present on the 1948 revision, and appears again on the twenty-five-inch OS map, suggesting it persisted as a recognised local designation across more than a century of mapping. The name is a clue. Writing in 1905, the historian William Carrigan noted that High Rath, a sub-division of Castle Eve, took its name from an ancient fort long since levelled. A rath is a ringfort, the kind of circular enclosure, typically defined by an earthen bank and ditch, that was the standard form of rural farmstead in early medieval Ireland. Carrigan gave no precise location for the fort he described, and it has remained unlocated in the formal record ever since. The cropmark enclosure in Castle Eve may be the very feature he was describing, a site whose physical form had already vanished by the early twentieth century and whose existence is now readable only from altitude and in the right growing conditions.