What survives is a roughly circular enclosure just over twenty-three metres across at its widest, ringed by an earth and stone bank, a U-shaped fosse, and a further outer bank beyond that. The fosse, the water-filled or simply defensive ditch that separates the inner bank from the outer, is narrow but still clearly defined, descending to about eighty centimetres at its deepest. The inner bank rises nearly one and a half metres above the level of that fosse, giving it a meaningful sense of enclosure from the outside, even if internally it presents only a low lip above the ground surface.

This is a rath, the Irish term for a ringfort, the most common monument type in the Irish countryside. Ringforts were typically built and occupied between roughly the sixth and tenth centuries, serving as enclosed farmsteads for early medieval families of varying social rank. The scale and elaboration of their defences, how many banks, how deep the ditches, tended to reflect the status of whoever lived within. The Lisgarriff example, with its inner bank, fosse, and secondary outer bank, suggests a degree of investment beyond the simplest single-banked examples, though it falls short of the more elaborate multivallate sites associated with higher-ranking occupants. What makes this particular site quietly puzzling is that no entrance feature is currently visible. Most ringforts preserve at least a gap or a causeway across the fosse where the inhabitants would have passed in and out; here, either that feature has been lost to erosion and time, or it remains obscured beneath later accumulation of earth and vegetation.