Measuring roughly seventeen metres from east to west and nearly six metres wide, the depression is filled with tumbled stone and rubble, the telltale signature of a souterrain that has given way under its own collapsed roof. A souterrain is an artificially constructed underground passage or chamber, typically built during the early medieval period in Ireland, often associated with nearby settlements and used for storage, refuge, or both. This one sits quietly in the grass, unmarked and easy to mistake for a natural hollow.

What makes its location particularly interesting is its relationship to the landscape around it. The souterrain lies approximately two hundred metres east of a possible conjoined ringfort, a type of enclosure in which two or more circular earthwork enclosures are joined together. The pairing of a souterrain with a nearby ringfort is a well-documented pattern in early medieval Ireland; souterrains were frequently dug within or close to such settlements, accessible from inside the enclosure and serving the people who lived there. Whether this souterrain was originally connected to that ringfort, or represents an independent and perhaps earlier or later feature of the landscape, is not firmly established. The rubble that now fills the depression hints at a stone-built structure of some ambition, but the collapse has left little to read from the surface.