The site sits within a rath, a type of circular earthen enclosure used as a farmstead during the early medieval period in Ireland, and in its south-western quadrant a long linear depression cuts from the inner edge of the enclosure's bank toward the north-east. What makes this quietly compelling is a single stone slab, projecting horizontally from the outer face of the bank roughly a metre below the interior ground level. Together, the depression and the slab suggest the presence of a souterrain, an underground stone-lined passage or chamber built beneath raths and used variously for storage, refuge, or both.

The depression itself is modest but telling: between two and three and a half metres wide and around sixty centimetres deep, it extends for nine metres in a roughly straight line. Souterrains are often identified precisely this way, as slight collapses or settled trenches where the roofing stones have shifted over centuries and the earth above has sagged into the void. The projecting slab at the south-western end is characteristic of a souterrain entrance lintel or passage cover, and its position at the scarp of the rath places it at the kind of sheltered, accessible point where such an entrance would logically be constructed. The association with the rath reinforces the interpretation, since souterrains in Ireland are almost exclusively found in connection with enclosed settlement sites of the early medieval period, broadly the fifth to twelfth centuries.