Raths, the circular earthwork enclosures that once served as farmsteads across early medieval Ireland, are common enough across the Kerry landscape, but internal mounds of this kind are a less expected feature. These four sit within the enclosed area, each roughly 1.2 metres in diameter and 0.4 metres high, low and unassuming in a way that makes them easy to overlook.

The rath at Tubrid Beg is classed as univallate, meaning it has a single enclosing bank rather than the multiple rings found at more elaborate sites. That bank is accompanied by an external fosse, a defensive ditch running outside it, and the whole thing takes a sub-circular shape. To the northwest, north, and northeast, a fieldbank curves around the fort, suggesting that the landscape here has been managed and layered over a long period. The site was documented as part of the North Kerry Archaeological Survey, published in 1995 by C. Toal, which brought together a systematic record of monuments across this part of the county. The purpose of the interior mounds is not stated in that record. They may have been storage features, structural remnants, or something else entirely, and their ambiguity is part of what makes the site quietly interesting.