The straight southern side runs for around 50 metres, while the enclosure extends roughly 23 metres from north to south, its boundary defined not by any dramatic bank or wall but by a low, levelled scarp barely 30 centimetres high and a shallow fosse, a defensive ditch, that is more impression than obstacle at this point. What is unusual here is not any single element in isolation but the layering: several distinct features overlap and adjoin one another, suggesting that this corner of Tipperary was shaped and reshaped across an extended period of use.

Within the D-shaped enclosure, offset towards the northwest, traces of a smaller rectangular feature survive as a gentle depression in the ground, roughly 6 metres by 5 metres. It is best appreciated from the south-southeast and west-southwest sides, where the hollow reads most clearly against the surrounding ground. To the south, further features are faintly visible but resist any obvious interpretation, forming no discernible pattern. A linear earthwork adjoins the complex to the east-northeast, and additional possible earthworks lie to the north and northwest, hinting at an arrangement that extends well beyond the enclosure itself. The site sits adjacent to a second enclosure immediately to the south, making Rathbrit something of a cluster rather than a solitary monument, though the relationship between all these elements remains unresolved.