There is no hollow in the ground, no lintel stone poking through the grass, no darkened gap in a field bank. It has disappeared entirely into the landscape above it, leaving only a reference in an old paper to mark its existence.

A souterrain is an underground stone-lined passage or chamber, usually associated with early medieval settlement in Ireland, thought to have served for storage, refuge, or both. This one sits within a ringfort, the circular earthwork enclosure that was the standard form of rural farmstead from roughly the sixth to the twelfth century. The pairing is common enough; souterrains are frequently found inside ringforts, tucked against the interior of the bank. What we know of this particular example comes from a single source: Bowman, writing in 1934, who noted the site of a souterrain in the south-east corner of the fort. That brief phrase, a location within a location, is the entire documentary record. No dimensions, no description of the structure, no account of whether it was entered or merely identified by a surface feature that has since been lost.