It is the kind of detail that rewards the attentive: not a ruin you can photograph from a distance, but a place where the archaeology is half-felt rather than seen.

The structure is a souterrain, an underground passage built from drystone construction and covered with large flat lintels, a type of feature common across early medieval Ireland and typically associated with settlement enclosures. This one sits in the western half of a cashel, a circular stone-walled enclosure of the kind used as a farmstead or defended homestead in early Christian Ireland. A lintelled opening at ground level leads down into a passage roughly one and a half metres wide, which runs for about three metres to the south-south-east before hitting a blockage of tumbled stone. To the north of the entrance, the ground dips slightly, a shallow grassed-over depression marking where a further section of the passage has given way. At the northern edge of that depression, a stone slab can be felt just beneath the turf, most likely another lintel still sitting more or less where it was originally placed. Souterrains were probably used for storage, refuge, or both, their cool subterranean environment making them practical as well as defensible.