At Cleanrath in County Cork, there is a ringfort, and within that ringfort there was, apparently, a souterrain. A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement and used variously for storage, refuge, or both. At Cleanrath, however, even the rumour of one is about all that remains.

Writing in 1934, a researcher named Bowman noted that local tradition held a souterrain to have existed on the site, but that repeated ploughing had erased any visible trace. That observation has not aged into irrelevance. The land has continued to be worked, and nothing has since come to light to confirm the underground feature directly. The ringfort itself, a roughly circular enclosure of the kind built across Ireland during the early medieval period, survives as context, but the souterrain it may once have contained exists now only as hearsay preserved in a footnote.