At Farrannacarriga on the Dingle Peninsula, a ringfort once known as Lisraturraun, or An Lios in Irish, appeared on Ordnance Survey maps for long enough to be recorded and named, but has since disappeared from the landscape entirely. What makes it worth noting is not the vanished earthwork itself but what it contained beneath the ground: a souterrain, or possibly more than one.

A souterrain is an underground passage or chamber, typically constructed during the early medieval period in Ireland, often associated with ringforts and used variously for storage, refuge, or ventilation of perishable goods. The ringfort at Lisraturraun was of the simplest type, a univallate enclosure, meaning it was defined by a single earthen bank rather than multiple concentric ramparts. According to Pádraig Ó Siochfhradha, writing under his pen name An Seabhac in 1939, the site held at least one such underground feature. The ringfort itself, circular in plan and enclosed by that earthen bank, is described in J. Cuppage's 1986 archaeological survey of the Corca Dhuibhne region as no longer surviving, meaning the above-ground element had already been lost or severely degraded by the time of systematic recording.

What this leaves is a kind of layered absence. The bank that would have defined the settlement is gone. Whether the underground passages beneath it still exist in some form, collapsed, infilled, or simply unlocated, is not recorded. The Dingle Peninsula carries an unusually dense concentration of early medieval and prehistoric remains, and the loss of even a modest ringfort represents a small but real gap in that record. An Lios survives now only in a placename, a nineteenth-century map line, and a brief note from a writer who knew the local landscape well enough to document what others had already begun to forget.