The ringfort at Liscullane does none of these things. It has been levelled entirely, leaving no visible trace on the ground, and yet in 1987 an aerial photograph picked it out with surprising clarity, its circular outline still readable from altitude even after whatever agricultural or infrastructural work had erased it at ground level. That gap between invisibility underfoot and legibility from the air is one of the quieter puzzles of Irish field archaeology.

A rath, as ringforts of this earthen type are generally known, was typically a circular enclosure defined by one or more earthen banks and ditches, used during the early medieval period as a farmstead or defended homestead. The Liscullane example was recorded on the Ordnance Survey map of 1841 to 1842, which means surveyors could still identify it clearly at that point. By the 1916 edition of the OS map, however, it was no longer marked with the same confidence, suggesting the site had already begun to lose definition over the intervening decades. Running immediately to the south-east of the site is the Limerick and Tralee railway line, whose construction in the nineteenth century reshaped considerable stretches of the north Kerry landscape, and which may well have contributed to the gradual effacement of whatever earthworks remained.