The site is associated with a ringfort, one of those circular earthwork enclosures built across Ireland during the early medieval period, typically as a defended farmstead. Souterrains, which are man-made underground passages or chambers usually constructed from stone, are a fairly common feature of ringfort sites; they served variously as storage spaces, places of refuge, or both. What makes Dromnacaheragh quietly interesting is that the souterrain here exists, so far as anyone can establish, only as tradition. There is no visible surface trace of it whatsoever.

The association between the underground chambers and the ringfort survives through local oral memory rather than physical evidence. No excavation appears to have confirmed the souterrain's presence, and nothing on the ground currently marks where it might lie. This is not entirely unusual in Irish archaeology; souterrains can collapse inward over centuries, leaving the surface above them apparently undisturbed, and ringforts themselves are often reduced to faint earthwork traces or lost entirely beneath later agricultural activity. What persists at Dromnacaheragh is the knowledge that something was once there, or was believed to be, passed along in the way that communities tend to hold onto the memory of things that have disappeared underground, sometimes literally.