It is not dramatic in scale, measuring about 49.5 metres east to west and 30 metres north to south, and a casual walker might pass the low surrounding earthworks without registering them as anything deliberate. But the geometry is purposeful, and the slight asymmetry of the defences tells a quiet story about how the site was built and used.

A rath is an earthen ringfort, the most common surviving monument type in the Irish countryside, typically dating from the early medieval period, roughly 500 to 1000 AD, and thought to have served as the enclosed farmstead of a prosperous family. At Ardgivna, the enclosure is defined on its eastern side by a low earthen bank, still around 0.9 metres high on the outside, with a gap of about 1.5 metres that likely marks an original entrance. The rest of the perimeter relies on a natural or partially shaped scarp, a steep slope cut into the ridge, rising to about 1.5 metres. There are traces suggesting that both faces of the bank were once lined with stone, a detail that would have given the structure a more formal, dressed appearance than the grass-covered humps visible today. Most intriguing is a short, separate length of bank sitting about 3.2 metres out from the western scarp. At only four metres long but over four metres wide, it seems oddly substantial for its modest height, and may represent what survives of an outer enclosing bank, a feature that would place this rath among the double-banked examples thought to indicate slightly higher status than a single-ring enclosure.

The ridge setting itself is typical of the practical logic behind rath placement: elevated enough to command a view and drain well, narrow enough that the natural topography contributes to the defences without requiring extensive earthmoving. The stone-facing detail, if confirmed, would reward closer inspection of the exposed scarp edges, where the underlying structure of the bank can sometimes be read in section.