The humps and hollows of its fallen passages and chambers are still discernible underfoot and through the vegetation, though nature has been doing its best to reclaim the whole arrangement. It is the kind of site that rewards a careful eye rather than a dramatic reveal.

A souterrain is an underground stone-lined passage or series of chambers, typically built during the early medieval period in Ireland and associated with ringforts. They were used variously for storage, refuge, or as a means of escape, and they are commonly found in conjunction with the type of earthwork enclosure known as a rath, which is a circular bank and ditch defining a farmstead. The Doonflin example sits within exactly such an enclosure, and the association is entirely typical, even if the degree of collapse here means the souterrain itself can no longer be entered or easily traced in full. What survives is enough to confirm that this was once a structured underground feature of some complexity, with distinct passage and chamber elements now folded into the earth.