Roughly eight metres north to south, three metres east to west, and less than a metre deep, it sits along the eastern scarp of a rath, the circular earthen enclosure used as a defended farmstead during the early medieval period in Ireland. According to local tradition, this unassuming depression marks the site of a souterrain, an underground stone-lined passage or chamber typically built beneath or beside a rath, used variously for storage, refuge, or both. No structural remains are visible at ground level, which means the tradition rests entirely on memory and landscape reading rather than any exposed stonework.

The rath itself, recorded separately, provides the context that gives the hollow its meaning. Souterrains are commonly found in association with raths across Ireland, and their entrances were often deliberately concealed or have simply collapsed over centuries of agricultural use and natural settling. What survives here is the shape of the land and the knowledge that has been passed down about what that shape once signified. It is a reminder that not every archaeological site announces itself, and that sometimes what a community remembers is the only record that remains.