Roughly 32 metres across in both directions, this earthwork enclosure at Ballyslatteen is the kind of feature that makes more sense the longer you stand and look at it. The ground gives it away in layers: an earthen scarp running all the way around, backed on the outside by a fosse, which is essentially a ditch cut into the ground, roughly 7.75 metres wide and half a metre deep, curving from the west around the north and east to the south-west. Beyond that fosse, a wide, flat-topped bank adds another line of definition. It is a subtle but deliberate arrangement, and it is remarkably intact.

The entrance survives at the eastern side, a causewayed gap of between four and five metres where the fosse was left uncut to allow access. Causeways like this are a recurring feature of early Irish enclosures, preserving a formal threshold into the interior rather than simply leaving a gap in the bank. Inside, the ground is generally level, but there is a slight rise at the centre, and it is there that the remains of a hut survive, suggesting this was not merely a field boundary or stock enclosure but a place where someone lived, or at least sheltered, within the protected circuit. A second enclosure lies roughly 750 metres to the south-east, hinting that this part of the Suir flood plain was once considerably more occupied than its present pastoral quiet would suggest.