It looks, at first glance, like a ringfort, the circular enclosures built across Ireland during the early medieval period, typically as farmsteads enclosed by an earthen bank and ditch. But there is a complication. By the time the Ordnance Survey mapped the area at 25 inches to the mile in 1913, this particular earthwork appeared not as an ancient enclosure in a field but as a tidy grove of trees standing east of the main avenue to Clonyn House. Whether it began as a ringfort and was later repurposed as an ornamental tree-ring, or whether it was constructed as a tree-ring from the outset after 1700, remains genuinely uncertain.

The structure itself measures roughly 29 metres north to south and 23 metres east to west, enclosed by an earthen bank with a narrow external fosse, the shallow ditch that typically runs around the outside of such monuments. Visible inside the enclosure are cultivation ridges running NNE to SSW, faint corrugations in the ground that suggest agricultural use at some point in its history. Two further earthworks lie close by, one approximately 125 metres to the east, another around 95 metres to the south-southeast, and the same ambiguity applies to all three. It is possible that the landscaping of Clonyn House demesne simply absorbed pre-existing early medieval enclosures, planting trees within them to create the kind of atmospheric woodland features fashionable in designed demesnes of the eighteenth and nineteenth centuries. It is equally possible that all three were purpose-built as landscape features and share no prehistoric or early medieval origins at all. The cultivation ridges visible inside this one complicate both interpretations, suggesting a period of agricultural use that fits awkwardly with either a purely ceremonial early medieval enclosure or a purely ornamental post-1700 tree-ring.