A shallow depression, roughly six metres long and running north to south, marks what remains of a souterrain, an underground stone-lined tunnel or chamber that early medieval communities used for storage, refuge, or concealment. What makes this one quietly notable is not just its survival in the landscape but the object that turned up inside it: an ogham stone, one of those upright slabs incised with a form of early Irish writing that uses a series of notches and strokes along a central line to encode names, typically those of the dead or of lineage.

The souterrain sits in the south-eastern quadrant of the ringfort it belongs to, tucked against the eastern bank. A J. Coleman, writing in 1947, recorded what was then still partially exposed: a trench around ten feet long with corbelled side walls, meaning the stones were laid in overlapping courses to lean inward without mortar, and at the northern end a semi-circular corbelled wall closing the space. The passage varied between two and three feet wide, a tight fit even by the standards of structures that were never meant to be comfortable. That description was made from an open trench; today the feature has settled back into the earth, visible only as a depression roughly a metre deep. The ogham stone found within adds a particular strangeness to the picture. Whether it was placed there deliberately, used as building material, or arrived by some other route is not recorded, but its presence suggests the site had a longer or more layered history than the physical remains alone can tell.