Somewhere in the townland of Cruabhaile Uachtarach in County Waterford, a roughly oval patch of grass holds a quiet puzzle: an enclosure with no visible entrance. The earthen bank that defines it runs from south to north-north-east, enclosing an area about 27 metres from north to south and 21 metres from east to west, and nowhere along its circuit is there any obvious gap or gateway. Whatever came and went through this place did so by routes that have since vanished, or perhaps by one that was never meant to be obvious.

The enclosure sits on a gentle south and east-facing slope, with a stream running roughly north to south in a valley about 170 metres to the east. The bank survives best at the northern end, where it still stands to an internal height of around 1.5 metres and an external height of 1.8 metres, with a width of roughly 4 metres. Elsewhere it has been reduced to a low scarp, barely half a metre high in places. A fosse, the external ditch dug to heighten the defensive effect of an earthen bank, once ran from south to north-west, though it has silted and eroded to a shallow trace, only about 0.2 metres deep. A field bank also circles part of the site to the north-north-west and north-north-east. The most intriguing feature, built into the northern bank, is a souterrain. A souterrain is an underground stone-lined passage, typically associated with early medieval settlement in Ireland, used variously for storage, refuge, or both. Its presence here suggests the enclosure was not merely a livestock pen or field boundary but a place where people lived, or at least sheltered. The interior, now grazed by cattle whose hooves have worn and eroded the ground surface, offers little else that is immediately readable.