Lios Rua, meaning the russet ringfort, sits in Drom in north County Kerry, and while the name suggests colour and presence, what greets the eye today is something considerably more modest: a low, worn earthwork that in places barely registers above the surrounding ground.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more circular banks and ditches. Lios Rua is univallate, meaning it has a single enclosing bank, roughly oval in plan at approximately 35 metres north to south and 29 metres east to west. That bank has not fared evenly with time. Along the northern to western arc it survives only as a faint platform, barely distinguishable underfoot, while elsewhere it rises to around 1.2 metres both externally and internally, with an average width of about 4 metres. A gap of roughly 4 metres in the south-south-east sector of the bank likely marks the original entrance. The site sits around 166 metres south of the Coosheen stream, which would have made it a workable location for an early farming household. The name Lisroe, the anglicised form of Lios Rua, appears in C. Toal's North Kerry Archaeological Survey, published in 1995, which catalogued the site and provided the measurements and observations that form the basis of what is known about it today.

The earthwork is subtle enough that a visitor crossing the field without prior knowledge could easily walk past the northern arc entirely, reading it as nothing more than a slight unevenness in the ground. The better-preserved southern and eastern sections give a clearer sense of the original circuit, and the entrance gap in the south-south-east repays a moment's attention as a point where daily early medieval life, people and animals moving in and out, once had a fixed and deliberate threshold.