The earthen bank at Dromkeen encloses a sub-circular interior that sits noticeably higher than the surrounding ground, and at the centre of that raised space is a small oblong mound, roughly four metres long and less than two wide, rising just sixty centimetres above the interior surface. It is modest enough to walk past without much thought. But on the south-eastern exterior of the bank, partially within an adjacent dump, there is what appears to be an entrance to a souterrain, an underground stone-lined passage or chamber of the kind that early medieval farmers used for food storage or as a refuge, and the suspicion is that this underground feature connects directly to that quiet mound in the middle.

Raths of this kind are scattered across the Irish countryside in their thousands, but they are rarely as legible in their details as this one. The Dromkeen example is univallate, meaning it has a single enclosing bank rather than the two or three concentric rings found at higher-status sites. That bank is well defined, standing between 1.4 and 2.4 metres on its outer face, and access through it survives as a gap of roughly four metres on the western side, almost certainly the original entrance. Its internal diameter measures 33.4 metres north to south and 36.2 metres east to west. The site was documented by C. Toal in the North Kerry Archaeological Survey, published in 1995, which catalogued it as entry number 549. By that point, the rath's immediate surroundings had already accumulated the pressures common to such sites: a trackway along its northern and eastern edges, a quarry immediately to the south, a dump to the south-east.

The dumping and quarrying nearby have done the site no favours, and the possible souterrain entrance sits uncomfortably close to that disturbed ground to the south-east. The mound at the interior's centre remains unexcavated as far as the available record indicates, which means the question of whether it does indeed conceal an underground passage, or represents something else entirely, has not been answered.