That small inversion of logic is what makes this spot quietly compelling. The stone, recorded on the first edition Ordnance Survey six-inch map for County Waterford as "Duke's Stone", sits precisely on the line dividing Waterford from Tipperary in the Curragh area, marking a pivot in the wall's course while tilting slightly to one side.

The boundary wall itself is a substantial piece of construction, running two metres wide with a clay and sod core and outer stone facing on both sides. Because the ground slopes away toward Tipperary, the wall reads differently depending on which county you approach it from: it stands only 0.6 metres high on the Waterford face, but rises to a full metre on the Tipperary side. The Duke's Stone, measuring 1.2 metres tall, 0.8 metres wide, and 0.35 metres thick, clears the wall comfortably and would have been a visible landmark well before any administrative boundary was formalised here. Within a few metres of the stone, the wall also incorporates a stone drain to the east and carries a gap of roughly three metres cut through it to the north, details that suggest the boundary has been a working, practical feature of the landscape as much as a legal one. Who the "Duke" of the name refers to, and when the stone was first raised, remains unrecorded.