A souterrain is an underground stone-lined passage, typically built during the early medieval period and used for storage, refuge, or both; the form is found widely across Ireland, often in association with ringforts. This one, though, has been swallowed by generations of agricultural tidying-up, its outline buried under a mound of field-clearance rubble.

When Cody recorded the structure in 1989, it could still be read in outline. The souterrain ran in a roughly L-shape across a total length of around 24 metres. The longer arm, approximately 14 metres in length and 1.3 metres wide, ran WSW to ENE and was visible as a grass-covered depression. At its north-eastern end, one roof lintel remained in place, and just to the east another had shifted from its original position and lay loose among scattered stones. The shorter arm extended a further 12 metres in a north-easterly direction, its course marked only by a faint depression in the ground, terminating at a low grass-covered mound of stones. Even that much is now gone from view; the field rubble piled over the site has erased whatever surface trace once remained.