Known locally as Lissapheepera, this circular enclosure in Knockreagh, County Kerry, was recorded on the Ordnance Survey maps of 1841 to 1842, drawn at a time when such early medieval farmsteads were still leaving some impression on the landscape. Ringforts, or raths, were typically enclosed farmsteads, their circular earthen banks defining a domestic space used throughout the early medieval period in Ireland. By the time the next major OS revision came around in 1914 to 1915, only the northern through eastern to southern arc of the enclosure was legible enough to map. The rest had already faded from the surface.

What makes Lissapheepera particularly curious is that its most informative record came not from a field survey but from the air. Aerial photographs taken by the Geological Survey of Ireland in 1974 revealed the outline of the enclosure as a faint crop mark, the kind of ghostly impression that appears when buried features alter the growth rate of the plants above them. Soil disturbed by ancient ditches tends to retain moisture differently from the surrounding ground, and in certain conditions that difference shows in the colour and height of crops. It is often the only way vanished sites disclose themselves. The enclosure sits on gently south-sloping pastureland to the north-east of another recorded site in the same townland, suggesting this was once a settled and worked corner of north Kerry. Today, no surface trace survives at all.