The enclosure in the townland of Umrygar is the kind of monument that agricultural improvement was supposed to erase, yet it endures, defined by a fosse, a cut or ditch dug around its perimeter, whose form shows up clearly on aerial photography despite the levelling work done to the land around it.

The site sits on flat, wet grassland that has been reclaimed over time, with linear drainage channels running visibly through it at the north-west and south-east. Coves Brook marks the townland boundary to the north and north-east, with the village of Carnew lying roughly 600 metres beyond that. A second enclosure is recorded approximately 70 metres to the north-north-west, which raises the possibility that this was once a more densely settled or organised landscape than the damp pasture now suggests. Circular enclosures of this kind are among the most common monument types in the Irish countryside; they served variously as farmsteads, burial grounds, or places of assembly across many centuries, and the fosse defining this example would originally have been accompanied by an internal bank, the material dug out to mark and bound whatever activity took place within.