The bungalow now occupying the site sits off-centre to the south-west, meaning the interior of the monument, which measured roughly 26 metres north-east to south-west and 25 metres north-west to south-east, is divided between the house footprint and the rear garden, where a garden shed occupies the eastern sector. The ancient boundary has not disappeared so much as been reassigned.

Circular enclosures of this type, defined by a single enclosing element such as a bank or wall, are among the more common monument types in the Irish landscape, often interpreted as early medieval ringforts used for settlement and the enclosure of livestock. What makes Cloonaherna of particular interest is the degree to which the archaeology persists despite everything. An arc of collapsed drystone walling, running approximately 25 metres along the north-east to south-east arc of the original enclosure, now functions as the boundary between the rear garden and the native woodland pressing in from the east. Its curvilinear profile is immediately distinctive: the garden boundary follows a clear curve at exactly this point, then straightens abruptly on either side where it continues as an ordinary linear field boundary. The wall itself, though heavily degraded and obscured by banked-up debris and vegetation on both faces, retains a width of around 2.5 metres overall, with the interior and exterior faces surviving to roughly half a metre in height. Drystone walling, built without mortar, relies on the careful interlocking of stones, and even in collapsed form the mass of material here hints at what the original enclosing element once amounted to. The site was already mapped as a circular enclosure on both the 25-inch and the 1921 edition of the six-inch Ordnance Survey maps, meaning its outline had been recognised and recorded long before the bungalow arrived.