Within a radius of roughly a hundred metres, there are at least three other cashels, one of which also contains a souterrain, an underground stone-lined passage typically associated with early medieval settlement and used variously for storage, refuge, or ventilation. The cumulative effect is that this low-lying, scrub-covered corner of County Clare was once, in some sense, a neighbourhood.

A cashel is a ringfort built from stone rather than earth and timber, a form of enclosed farmstead associated primarily with the early medieval period in Ireland, roughly the fifth to twelfth centuries. The Ballynahown example sits on slightly raised ground, which would have given its occupants westward views across the ocean, and the exterior height on the southern and south-eastern sides still reaches between 1.7 and 2 metres, suggesting the original enclosing wall was substantial. Today the wall is best preserved from the south-east to the south-west, where it survives as a stone and earth bank between three and four metres wide, though much of the circuit has been reduced to a low scarp. A later wall, probably agricultural in origin, cuts through the site on the northern side, a common enough intrusion on monuments that remained useful landmarks or boundaries long after their original purpose was forgotten. The interior is uneven underfoot, with overgrown stone making the ground difficult to read. A large natural boulder sits just outside the cashel to the north-north-east, its relationship to the site, whether incidental or deliberately incorporated into the layout, left open by what the ground can tell us.

The scrub and overgrowth that now cover the site make close inspection physically awkward, and the wall-facing is only partly legible, with outer facing stones visible to a height of around 0.45 metres. The most informative approach is from the south or south-east, where the wall's height and profile are clearest. The broader interest of the place lies in reading it alongside its neighbours, four early medieval enclosures clustered within a few hundred metres of one another on what is now unremarkable Atlantic-facing scrubland in Clare.