That unglamorous association sits interestingly alongside the considerable effort that evidently went into building it. The site at Drommartin in north Kerry is a cashel, meaning a ringfort enclosed by a stone bank rather than an earthen one, and what survives here is considerably more intact than the fields that surround it might suggest.

The enclosing bank stands up to 2.8 metres above the external fosse, a shallow ditch that runs around the entire perimeter, and averages 7 metres wide at the base. The interior, roughly 23 metres north to south and 26 metres east to west, sits at a noticeably higher level than the surrounding pasture. Inside, the most compelling feature is a souterrain, an underground stone-lined passage or chamber used in early medieval Ireland for storage or concealment. Here the drystone walling of at least one chamber is clearly visible, and the tunnel appears to run through the northern bank before curving south-east toward a second chamber, the two separated by only about two and a half metres. In the western part of the interior, a rough mound of stones and a small adjacent depression hint at further structural remains whose purpose is less easily read.

The site sits on gently southward-sloping pastureland, which means the bank and fosse read particularly well from certain angles, the stonework holding its form across a largely open landscape. The souterrain chambers are among the more legible features, the drystone construction remaining visible without excavation, which is relatively unusual for sites that have endured centuries of agricultural activity.