It sits roughly forty-five metres south of a pair of conjoined raths, the circular earthen enclosures that once served as the defended farmsteads of early medieval Irish families. Whether the depression is the collapsed remnant of a souterrain, an underground passage typically built of dry stone or rock-cut tunnels and used for storage or refuge, or simply an old gravel pit that has since been filled in, remains unresolved. The ambiguity is the thing. Most ancient features in the Irish landscape are at least tentatively identified; this one sits in a bureaucratic and archaeological no-man's-land, recorded but not understood.

The feature's orientation offers the only firm description available. Its long axis runs northwest to southeast, while a shorter branch extends from roughly the midpoint of the eastern side in a northeast to southwest direction, giving it that distinctive Y-plan when viewed from above. Proximity to the raths is suggestive. Souterrains are frequently found in association with rath complexes throughout Ireland, often accessed from within the enclosed area and extending outward underground, and a distance of forty-five metres between a rath and a souterrain entrance is not implausible. But the gravel pit explanation cannot be dismissed either, and without excavation the ground is keeping its own counsel.