What makes it quietly arresting is the geometry: an enclosure roughly 75 metres along its longer axis and 40 metres across, defined not by stone but by a low earthen bank and an outer fosse, the fosse being the shallow trench dug to provide the material for the bank beside it. The whole thing slopes gently southward, and the bank, where it can be measured on the western side, rises only about 0.8 metres above the surrounding ground on its outer face. That is modest enough to overlook entirely if you were not looking for it.

The earliest cartographic record of the site comes from the 1836 edition of the Ordnance Survey six-inch map, which shows it as a wooded enclosure, already interrupted at its south-eastern edge by a field bank running north-east to south-west. That field boundary has done lasting damage to the legible extent of the site; south-east of it, the enclosure simply disappears, either ploughed out or buried beneath later agricultural reworking of the land. Enclosures of this kind in the Irish midlands and east are often associated with early medieval settlement, where a bank and fosse combination would have defined a farmstead or a higher-status residence, though without excavation it is not possible to say more about the date or function of this particular example. The D-shape itself, rather than the more common roughly circular form, may reflect the way the enclosure was fitted to the natural contour of the ridge end.