Others survive only as a line on an old map, their physical presence long since swallowed by ploughing, drainage, or the slow accumulation of centuries of agricultural work. The enclosure recorded at Clonyharp, in County Tipperary, belongs to this second category. No earthwork marks the ground, no stone breaks the surface; the place exists now almost entirely as an absence.

What is known comes from a single cartographic source: a map of the townland held in the National Library of Ireland. Enclosures of this kind were typically roughly circular or oval boundaries, formed from earthen banks, ditches, or stone walls, and they served a wide range of purposes across Irish prehistory and the early medieval period. Some enclosed farmsteads, some defined ceremonial or burial grounds, and others functioned as livestock enclosures or defended settlements. Without further archaeological investigation at Clonyharp, it is impossible to say which of these purposes this particular example served, or when it was constructed. The map notation is the only surviving witness to its existence.

There is a particular quality to a site like this, where the significance lies not in what can be seen but in the fact that something was once there at all. The landscape of Clonyharp carries no obvious sign of what the cartographer once thought worth recording.