For years this earthwork near Clongeen was catalogued as a moated site, the kind of rectangular, water-filled enclosure associated with Anglo-Norman settlers of the medieval period. But the ground tells a different story. The enclosure is circular, not rectangular, and the accumulated evidence points far more persuasively to a rath, the ringfort-type structure built and occupied by native Irish farming families, typically during the early medieval period between roughly the fifth and twelfth centuries.

The confusion is partly understandable. When the Ordnance Survey mapped this area in 1839, the feature was recorded as a rectangular bivallate enclosure, meaning one defined by two concentric banks and ditches, with external dimensions of approximately 50 metres east to west and 45 metres north to south. What survives on the ground today is rather more modest but still legible. A circular area roughly 27 metres across is defined by an earthen bank, a flat-bottomed dry fosse (the term for a defensive ditch), and an outer overgrown bank with a drain running roughly northwest to southeast. The northern section preserves the best profile, with the outer face of the bank rising to around 1.4 metres. Elsewhere the definition is softer, reduced in places to a scarp of less than a metre. The interior has been quarried at some point, and the resulting spoil mound has slumped westward, burying much of the inner bank and fosse on that side. A gap through the outer bank on the west is almost certainly a later insertion, using that same spoil as a rough causeway.

The site sits towards the bottom of its slope, with the headwaters of a small stream running roughly north to south about 170 metres to the east, a placement consistent with the practical logic of early settlement, close to water but not prone to flooding. The discrepancy between what the 1839 map recorded and what now exists on the ground may reflect both subsequent disturbance and the limitations of early survey methods when dealing with earthworks that had already degraded considerably by that date.