Others exist only in old notebooks. A ringfort on the Iveragh Peninsula in County Kerry belongs firmly to the second category: a place that was already half gone when anyone thought to write it down, and which has since vanished entirely from the landscape.

In 1927, a researcher named Ua Riain noted two features locally called 'lisses' in a field known as 'Parkalour' at Boulerdah. A liss, or rath, is an enclosed circular settlement of the early medieval period, typically defined by one or more earthen banks and ditches, and used as a farmstead or high-status residence. Even at the time of Ua Riain's visit, only half of the eastern example survived, measuring roughly 53 feet, or 16.1 metres, across. A second, smaller enclosure sat approximately 27.5 metres to the west. Neither site appears on Ordnance Survey maps, which suggests they were already too degraded to merit cartographic attention even in the nineteenth century. Today there is no surface trace of either feature; the field at Parkalour gives no visible indication that anything once stood there at all.

What makes this place quietly notable is precisely its absence. The documentation that survives captures a site in the act of disappearing, observed at what turned out to be almost the last possible moment. The gap between Ua Riain's 1927 fieldwork and the present represents not just the loss of earthworks but the erasure of a domestic landscape that had already endured for over a thousand years.