That absence is, in its own way, the point. A ringfort, or rath, once occupied this ground, a circular enclosure of the kind built across Ireland from roughly the early medieval period onwards, typically defined by an earthen bank and ditch that enclosed a farmstead or small settlement. At Mountoven, even that much is gone.

The fort appeared on Ordnance Survey maps as a single ring of hachures, the conventional cartographic shorthand for an earthwork, and it was marked simply as "Fort" on the Fair Plan. As recently as 1949, an aerial photograph taken by the Ministry of Defence clearly showed a circular enclosure defined by a single bank or wall, the classic form of a rath visible from above even when it had become largely invisible at ground level. Sometime after that, the land was reclaimed for agricultural use. J. Cuppage documented the site in the 1986 Corca Dhuibhne archaeological survey of the Dingle Peninsula, but even by that point the physical evidence had been erased. No bank, no trace of a wall, no surface indication that anything was ever there.

What makes the site worth noting is precisely this layering of documentation against absence. The maps recorded it, the aerial photograph confirmed it, the survey named it, and the land swallowed it. The 1949 photograph remains the last clear image of the enclosure as it stood, a circular form on a hillside above the bay, now existing only in an archive rather than in the ground.