Souterrains are underground stone-lined or rock-cut passages and chambers associated with early medieval ringforts, the circular enclosed settlements that once dotted the Irish countryside in their thousands. They were likely used for storage, refuge, or both, and this one had been waiting undisturbed beneath ordinary agricultural ground.

The souterrain sits within what was once a ringfort, now levelled, meaning the circular earthen bank and the enclosed settlement it defined have been ploughed away over time until nothing visible remains above ground. Described by Cleary in 1986, the structure consists of two chambers connected by a creepway, a low narrow passage just wide enough to squeeze through, which would have made uninvited access considerably more difficult. The first chamber is irregular in plan, measuring roughly 2.5 metres on its longer axis and standing between 1.2 and 1.5 metres high, with evidence of a construction shaft at its western end. Construction shafts are the openings dug from above to allow builders to work inside before being sealed off once the structure was complete. The second chamber is oval, slightly longer at around 2.5 metres, and also retains a construction shaft as well as an entrance shaft at its north-western end. Both chambers are described as much disturbed, meaning collapse, silting, or interference over the centuries has obscured much of the original fabric. The structure is partially earth-cut and partially rock-cut, which reflects the natural variation in what the builders encountered as they dug.