On a broad north-to-south ridge in Greenan, County Waterford, there is a circular earthwork that has been quietly losing the argument with the surrounding landscape for some considerable time. The enclosure measures roughly 35 metres across, defined by an earthen bank faced on its outer side with stone, a combination that suggests some care was taken in its original construction. That outer face still carries a height of about 1.4 metres on the exterior, slightly less on the interior side, and the bank itself is around 3.5 metres wide. What there is not, noticeably, is any fosse, the term for the external ditch that typically accompanies earthworks of this kind. Its absence here is one of the features that makes the site a little harder to read.

Embanked enclosures of this type are found across Ireland and tend to date broadly to the early medieval period, though without excavation it is difficult to be precise about any individual example. They may have served as farmsteads, enclosures for livestock, or spaces with a more ceremonial character. At Greenan, the southeast entrance, originally about 2 metres wide, is now blocked, and the section of bank running west to northwest has been largely destroyed. The interior has been filled over time with spoil from field clearance, which means that whatever was once inside, any structural traces, post holes, or occupation layers, lies buried under the accumulated debris of agricultural tidying. The stone-facing on the outer bank survives well enough in places to give a sense of how the enclosure once presented itself to the ridge around it, though the whole is now heavily overgrown.