It is sub-rectangular in shape, roughly nine metres from north to south, and unusually, its eastern side is left open rather than closed. That open eastern face sets it apart from the standard logic of an enclosure, which would normally be sealed on all sides to contain livestock or mark out a domestic space, and it invites a certain amount of puzzlement about what exactly the structure was meant to do.

The site sits in an area of rough grazing and scrub, the kind of marginal land that often preserves early features simply because it was never worth the effort of clearing them away. It was identified from aerial photography, specifically imagery taken between 2011 and 2013, and from Google Earth orthoimages, which have become increasingly useful tools for spotting low-lying or overgrown stone remains that resist detection at ground level. About ninety metres to the south-east lies a separate hut site, suggesting that this corner of Foilatrisnig may once have supported a small cluster of activity, though the relationship between the two features remains unclear. Without excavation, it is difficult to say whether the enclosure is early medieval, early modern, or something in between.