The locals call it the Lios, a word derived from the Irish for an enclosure or fortified place, most commonly associated with the ringforts that were built across Ireland from the early medieval period onward as farmsteads for prosperous families. This one measures roughly 41 metres across, its enclosing bank of earth and stone standing only about 0.3 metres above the interior ground level, and 0.7 metres on its outer face, which gives a sense of how much the whole structure has settled and spread over time.

What makes the Lios at Redwood quietly curious is what it lacks as much as what it retains. There is no detectable entrance feature, no external fosse, which is the ditch that typically runs around the outside of a ringfort and whose upcast material usually forms the bank itself. The absence of a fosse here is notable; many ringforts relied on the combination of ditch and bank to create both a physical and a symbolic boundary, and the lack of one can sometimes suggest an enclosure of a different function or period. The bank has also been destroyed along its southern arc, perhaps by later agricultural activity or by the simple pressure of the land being worked around it for generations. The interior slopes gently from east to west, following the natural lie of the ridge end on which the whole structure sits.