What makes this particular site worth pausing over is its combination of scale, preservation, and complexity: an oval rath, roughly 80 metres east to west and 71 metres north to south, defined not by a single bank but by two concentric earthen banks with a fosse, or ditch, running between them. A rath is a roughly circular or oval earthwork enclosure, typically dating to the early medieval period and associated with a farmstead or settlement of some status. The double-bank arrangement here suggests the enclosure was either unusually well defended or belonged to someone of considerable local standing.

The layout is more intricate than a straightforward rath. A possible entrance survives at the south-east, which is a common orientation for such sites, and a field boundary of later date cuts across the monument at the north-west and south-west, the kind of agricultural intrusion that has erased so many comparable sites elsewhere. More unusual is the large subrectangular annexe abutting the rath on its eastern side, measuring approximately 52 metres north to south and 40 metres wide, and defined by its own pair of earthen banks with an intervening fosse. Annexes of this kind are thought to have served functional purposes such as housing livestock or storing goods, extending the working space of the main enclosure. Roughly 50 metres to the west lies a cashel, a stone-built enclosure of broadly similar date and function, suggesting that this ridge in Ardagh once supported a cluster of early settlement activity rather than a single isolated site.