There is something quietly unsettling about an archaeological site that exists more clearly on paper than it does in the ground. In the townland of Park in County Waterford, a circular enclosure roughly 55 metres across lies on a gentle south-facing slope in ordinary pasture, and by all accounts you could walk straight across it without any sense that you were crossing anything at all. No earthwork rises to meet the eye, no ditch announces itself. The feature is, in the language of field archaeology, not visible at ground level.

What we do know comes from the first edition of the Ordnance Survey six-inch map, produced in 1840, where a faint circular marking suggests that something was recorded here during the original survey. The OS teams of that period were methodical, working townland by townland across the country, and their draughtsmen noted features, sometimes tentatively, that locals may have pointed out or that showed just enough trace in the landscape to warrant inclusion. Whatever the surveyors saw or were told about this enclosure, the form they recorded, a near-perfect circle of around 55 metres diameter, is consistent with a ringfort or related enclosed settlement of early medieval date. Ringforts, known in Irish as raths or lios depending on construction, were typically enclosed farmsteads surrounded by one or more earthen banks and ditches, and they are among the most common monument types in the Irish countryside. This one, if that is what it is, has since retreated entirely beneath the turf.