The one at Ballinahinch in County Wicklow is a more elaborate specimen: a bivallate ringfort, meaning it was defended by two concentric circuits of bank and fosse rather than one. That doubling of effort suggests either greater wealth or a heightened concern for security on the part of whoever once lived here, perhaps both.

The site sits on a gentle north-west-facing slope and measures roughly 33 metres across its inner enclosure. A ringfort's typical anatomy involves an earthen bank thrown up from a surrounding ditch, known as a fosse, and at Ballinahinch this basic pattern is repeated twice. The inner bank runs between five and seven metres wide and stands about 0.4 metres high, with its fosse reaching a depth of around 0.3 metres. Between the two circuits lies a berm, a flat strip of ground separating the inner from the outer defensive ring, which itself has a bank and fosse of similar, if slightly shallower, proportions. At its widest the entire complex extends roughly 65 metres north-west to south-east and 60 metres north-east to south-west. Entry was carefully controlled: the inner enclosure was reached from the south-east, where a two-metre-wide causeway crossed the fosse at a deliberate gap in the bank, while a second causeway at the south gave access through the outer circuit. These causeways are not accidental breaks; they are the original engineered thresholds of a planned enclosure.

Time and agriculture have done their work on the site. The outer bank and fosse have been lost entirely on the western side, and a field boundary cuts across the north-east sector. A small stream also crosses that corner of the site, though it appears to have shifted course over the centuries and may once have run along the line of the outer fosse, perhaps integrated deliberately into the original scheme of enclosure.