It measures only seventeen metres across, yet its outer bank still rises nearly two metres above the ground on the exterior side, giving it an imposing profile despite its modest scale. This is a rath, the Irish term for a ringfort, the most common monument type surviving in the Irish landscape. Thousands were built, mostly during the early medieval period, and were used as enclosed farmsteads by families of some local standing. This one, at Oldcastle in County Tipperary, has the typical features of its type: a circular raised area defined by an earthen and stone bank, an entrance gap facing east, and traces of an outer fosse, the defensive ditch that once ran around the perimeter, still visible in the north-western quadrant.

The asymmetry of the site adds some interest. Rather than sitting on a flat hilltop, the enclosure occupies the crest of an irregular, meandering ridge with a spur running to the south, which would have made it naturally prominent in the surrounding terrain. The steep external drop of the bank reinforces the sense that whoever chose this location was thinking carefully about visibility and defensibility. A citation to Stout's 1984 survey places formal scholarly attention on the site at least that far back, and the dimensions recorded then remain the basis for understanding the structure today. The entrance gap on the eastern side, roughly two and a half metres wide, aligns with a common preference in Irish ringfort construction, east-facing entrances being the most frequently recorded orientation.

A field bank now cuts across the interior from east to west, a later agricultural intrusion that divides the original space and complicates any reading of the ground surface. A road runs close to the north-western quadrant, bringing the modern world right up to the monument's edge. The dense overgrowth of gorse and fern makes the earthworks difficult to trace clearly on the ground, though the exterior bank, with its pronounced outward drop, remains the most legible feature from outside the enclosure.