At Lissaniska in County Kerry, a ringfort once occupied the landscape, its Irish name, Lios Ruadh or Lios Rua, meaning roughly "the russet ringfort", suggesting that at some point it had a distinctive character vivid enough to earn a colour in its name. Today, nothing of it remains above ground. No earthwork, no ditch, no raised bank. The site has been absorbed entirely into the surrounding land.

Ringforts, known as raths or lios depending on regional usage, were enclosed farmsteads typically dating from the early medieval period, roughly the fifth to twelfth centuries. They were usually formed by one or more circular earthen banks with an internal ditch, enclosing a domestic area where a family would have lived and kept animals. The Lissaniska example was recorded on the Ordnance Survey map produced in 1841 to 1842 as an oval enclosure, which was itself a slight irregularity, most ringforts tending toward the circular. A later OS edition shows it differently, appearing more round, and it is on that later map that the site first receives a formal designation. The discrepancy between the two surveys is modest but telling; cartographers working decades apart were trying to capture something that was already, perhaps, fading. C. Toal's North Kerry Archaeological Survey, published in 1995, records the site as number 437 and notes that no surface trace is now visible.

What survives is the name on the map and in the placename itself. Lissaniska preserves the element lios, and the fuller Irish form points toward a feature that was once visible enough to be described by its reddish-brown colour, whether that referred to the soil, the vegetation on the banks, or some other quality now impossible to recover.