It measures roughly 4.3 metres long and 3.5 metres wide, shaped like a flattened D, and it sits quietly at the centre of what may be a rath, a circular earthwork enclosure of the early medieval period. The hollow is thought to mark the blocked-up mouth of a souterrain, an underground stone-lined passage or chamber that was typically built beneath or beside a rath during the early medieval centuries. Souterrains served various purposes, most likely for cool storage and possibly as places of refuge, and they are found widely across Ireland, though many, like this one, survive only as depressions or faint traces where the original entrance has collapsed or been deliberately filled.

The double uncertainty here is what gives the site its quietly interesting character. The enclosure it sits within is described as a possible rath rather than a confirmed one, and the depression itself is only believed locally to conceal a souterrain. Neither claim has been archaeologically verified, which means the site exists in a provisional state, recognised but unresolved. Local tradition has preserved the memory of something underground at this spot, which is itself a form of evidence worth taking seriously. Communities living alongside earthworks over many generations often retain a folk knowledge of what lies beneath, passed down in the language of caves and fairy forts long after the original function has been forgotten.