On a gentle south-facing slope near Robertstown in County Waterford, a D-shaped patch of grass holds the faint outline of something older and harder to explain. The enclosure measures roughly 40 metres northeast to southwest and 33 metres northwest to southeast, defined by an eroded earthen bank that is still nine to twelve metres wide in places, though it rises no more than 0.3 metres above the surrounding ground. There is no visible fosse, the defensive ditch that typically accompanies earthworks of this kind, and no discernible entrance survives. What exactly it enclosed, and why, remains an open question.

Embanked enclosures of this type are a recurring feature of the Irish landscape, and their origins and purposes vary considerably. Some are early medieval in date and associated with settlement or farming activity; others may be prehistoric. The Robertstown example was recorded on the 1840 edition of the Ordnance Survey six-inch map, which gives a useful baseline for its survival but says nothing about when it was first constructed. By that point a road running roughly east-northeast to west-southwest had already cut across the southern side, truncating the enclosure and obscuring whatever lay there. A second enclosure sits approximately 90 metres to the northeast, which raises the possibility that the two features were once related, though no evidence has been published to confirm any such connection. The earthwork now reads as a quiet, grass-covered curve on the hillside, its bank worn low by centuries of weathering and agricultural use.