The rath at Glannaheera offers almost none of that. Sitting in open bogland on the Dingle Peninsula, roughly fifty metres south of a tributary of the Emlagh river, it has sunk so thoroughly into the surrounding landscape that its southwestern arc has essentially vanished. What remains of the bank rises just 0.4 metres on the interior face and 0.85 metres on the exterior, with a width of only 1.5 metres. Long grass, heather, and reeds have done the rest.

A rath is an earthen ringfort, the most common monument type in the Irish countryside, typically interpreted as an enclosed farmstead of the early medieval period. Most were defined by one or more concentric banks and ditches; this one is univallate, meaning a single bank encircles the interior. That interior measures 24.5 metres in diameter, a modest but not unusual size. Several gaps in the bank could indicate former entrances, though the most clearly defined faces northwest and measures 2.5 metres across. Whether that orientation was deliberate, or whether the surviving clarity of the northwestern gap simply reflects better preservation on that side, is difficult to say. The site was documented by J. Cuppage in the 1986 Corca Dhuibhne archaeological survey of the Dingle Peninsula, a systematic study of the area's monuments that remains a key reference for the region.