The trouble is, nobody can find it. No surface trace is apparent, and the structure exists, for now, only as local reputation and a reference in the archaeological record.

A rath, or ringfort, is an enclosed farmstead of the early medieval period, typically bounded by one or more earthen banks and ditches. Souterrains are underground stone-lined passages or chambers that were often built within or alongside raths, used variously for storage, refuge, or the keeping of dairy produce at a cool and consistent temperature. At Castleconway, the souterrain is said to lie in the south-western quadrant of the rath's interior, but whatever entrance or collapse feature might have betrayed its presence has either been obscured, filled in, or was never visible to begin with. The site appears in A. O'Sullivan and J. Sheehan's archaeological survey of the Iveragh Peninsula, published by Cork University Press in 1996, which catalogued the considerable density of early medieval remains across South Kerry.

What remains here is, in a sense, an absence. The rath itself provides the only visible context for a feature that may well survive intact below ground, waiting for some future survey technology or chance disturbance to confirm what local knowledge has long suggested.