The rath at Teermena has been absorbed so thoroughly into the working landscape that cattle have worn their own gap through the northern bank, roughly 1.2 metres wide, and the bank itself is abutted by modern field boundaries at the north-northwest and southeast. None of this is dramatic, but it is exactly that quality, the layering of centuries of unbroken land use, that makes the place worth attention.

A rath is the Irish term for a ringfort, a type of enclosed farmstead built predominantly between the sixth and tenth centuries, though some were constructed earlier or later. They are among the most common archaeological monuments in Ireland, with tens of thousands recorded across the island, and they typically served as the fortified homesteads of farming families rather than as military strongholds. The Teermena example is a fairly modest specimen: a roughly circular area measuring 30.1 metres north to south and 28.1 metres east to west, enclosed by an earthen bank that rises 1.3 metres on its exterior face but only 0.25 metres on the interior. Outside the bank runs a fosse, that is, a ditch, roughly 3.85 metres wide and 0.35 metres deep, running from the southeast around to the north-northwest. The formal entrance through the bank faces east-southeast and is 2.3 metres across. The survey notes were compiled by Denis Power and uploaded in August 2011.

The interior is described as level, dry, and clear of overgrowth, which is relatively uncommon for sites of this kind, where scrub and rushes frequently colonise undisturbed ground. The rath sits in level pasture, so there is no elevated approach or dramatic reveal; you are essentially looking for a low circular bank in a field. The clearest reading of the monument comes from walking the perimeter, where the difference in height between the interior and exterior faces of the bank becomes apparent, and where the fosse, though shallow, is still traceable for much of its arc. The concrete pillar at the entrance gap on the east-southeast side is the most immediately visible modern intrusion, and it serves as a useful locating feature when approaching across open ground.