It is easy to miss, and that is part of what makes it interesting. The earthen bank, roughly four to five metres wide and modest in height, encloses a space of about thirty-two metres in diameter, with what appears to be an entrance gap opening to the south-east. There is no ditch, or fosse, running alongside it, and no obvious trace of structures within.

Circular earthen enclosures of this kind are among the more quietly enigmatic features of the Irish archaeological landscape. Without a fosse, the site does not fit neatly into the category of a ringfort, the type of early medieval farmstead enclosure that once numbered in the tens of thousands across Ireland and typically combined a raised bank with an outer ditch. The absence of internal features visible at ground level leaves the function of the Cappagh enclosure genuinely open. It could represent a settlement, a stock enclosure, or something older still. The south-east orientation of the possible entrance is a detail worth noting; many prehistoric and early historic enclosures show a preference for eastward-facing openings, though what that preference meant to the people who built them remains a matter of careful debate among archaeologists.