It exists on maps and in registers, but the substance of what it is, how old it might be, and what purpose it once served has not been made publicly available.

Earthworks is a broad category that can cover a considerable range of human-made landscape features, from the low grassy banks of a ringfort enclosure to the platforms and ditches of a medieval settlement, to the subtle ridges left by field systems long since abandoned. Clare is a county where such features appear with some regularity, shaped by centuries of farming, defence, and ritual use of the land. Without further detail about Rinneen's particular earthwork, the form it takes and the period it belongs to remain open questions. That uncertainty is itself a kind of fact worth noting. Many monuments across Ireland sit in exactly this condition: identified, located, protected in principle, but not yet fully described or interpreted in any publicly accessible way.