At the eastern edge of a broad plateau in County Waterford, where the ground drops away towards the Aughnabrone river valley, a roughly oval bank of earth and stone traces out a boundary that has persisted in the landscape for an unknown length of time. What makes the enclosure at Ballindysert quietly unusual is not its size alone, roughly 55 metres across at its widest, but the fact that it has been absorbed so thoroughly into the working fabric of the land. Its bank, faced with stone and about three metres wide, has been pressed into service as a field boundary and as part of the townland division, so that an ancient enclosure and a modern administrative line share the same ground.

Enclosures of this subcircular form, defined by an earthen bank sometimes reinforced with stone, appear throughout Ireland and are often associated with early medieval settlement, though without excavation their date and function remain open questions. What the 1840 edition of the Ordnance Survey six-inch map makes clear is that by the time the surveyors passed through, the enclosure was already a recognisable feature, its outline legible enough to record. The slight scarp visible along portions of the perimeter where the bank has not been incorporated into a field wall suggests that the original circuit was once more continuous. Positioned as it is on the plateau edge, with the river valley opening out to the east, the site would have commanded a reasonably wide view of the surrounding ground, a consideration that was rarely incidental in choosing where to build.