What looks from a distance like a slight rise in the pasture is, on closer inspection, a rath, an oval earthen enclosure that would once have formed the defended farmstead of a family of some local standing. These ringforts, built in their thousands across Ireland roughly between the fifth and twelfth centuries, were the dominant form of rural settlement for much of the early medieval period, and this one at Ballyan is a quietly legible example of the type.

The enclosure is oval in plan, measuring approximately 28.5 metres north to south and 32 metres east to west, with an earthen bank that survives to around 0.7 metres on the interior face and 0.75 metres on the exterior. That may sound modest, but the bank would originally have been topped with a timber palisade or dense thorn hedge, making the whole structure a credible barrier against livestock theft and opportunistic raiding. The best-preserved section of the bank runs from the west-south-west around to the north-north-west, while the southern arc has been clipped by a later field boundary, a reminder that agricultural convenience has been quietly editing the archaeological record for centuries. The site was compiled and recorded by Denis Power, with notes uploaded in August 2011.

The interior, still under pasture, slopes gently downward toward the centre, and in places the underlying limestone bedrock breaks through the surface, reflecting the thin soils typical of this part of Limerick. That exposed stone gives the interior a particular character, especially after rain, when the pale rock catches the light against the surrounding grass. The site sits on private farmland, so access would require the landowner's permission; the surrounding countryside is working agricultural land and should be treated accordingly. There is no formal path or signage, but the hillock itself makes the enclosure reasonably easy to locate once you are in the general area and know what the slight rise and curved bank are likely to indicate.