A rath is an early medieval ringfort, typically an enclosed farmstead of the early Irish period, defined by a raised earthen bank and, usually, an outer ditch. This one, however, has no visible fosse, which is the surrounding ditch that normally accompanies such a structure, and no discernible entrance. What survives is a D-shaped platform, roughly 25 metres on its longer axis and less than a metre high, quietly subsiding into the agricultural landscape around it.

Its position on an east-facing slope above the valley of the Lask River is characteristic of how these sites were chosen. The river runs north to south, about a kilometre to the east and some 120 metres below, which means the enclosure would once have commanded a long view down into the valley without being fully exposed on the hilltop. That kind of oblique placement, close to but not at the summit, is common among early medieval farmstead sites across Ireland. Here, though, the site has been further complicated by later land divisions. A field bank and the townland boundary between Clonamona Upper and Knockbrandon Upper cuts directly through the monument at the northwest, and northwest of that boundary the rath is no longer visible at all, absorbed into or buried beneath the accumulated work of subsequent centuries.