On the 1923 Ordnance Survey six-inch map, a circular enclosure roughly ten metres in diameter is marked on a sharply angled, south-east-facing slope within the grounds of Cahermoyle House in County Limerick. When surveyor Denis Power visited the site, he found nothing. The pasture rolled on, the slope dropped away, and whatever had once been recorded there had been entirely levelled.

Circular enclosures of this scale are a familiar feature of the Irish countryside, often the remains of a ringfort or rath, an enclosed farmstead of the early medieval period, typically defined by one or more earthen banks and ditches. Whether this example was ever genuinely ancient is not certain. Power's notes raise the possibility that it was a landscape feature associated with Cahermoyle House, the demesne within which the site sits. Designed landscapes of the eighteenth and nineteenth centuries frequently incorporated artificial earthworks, mounds, and ornamental enclosures, and a small circular form on a prominent slope would not be out of keeping with that tradition. The 1923 mapping records what was there at the time, but it cannot tell us how old it was, or who made it.

The site sits within the private demesne of Cahermoyle House, so access is not straightforward, and there is in any case nothing visible to find once there. The interest here is less about standing in a particular spot and more about what the record itself reveals: that the archaeological inventory of Ireland contains absences as well as presences, places noted and then found wanting, monuments that had already slipped away before anyone thought to look closely. The 1923 map square that once held a neat circular symbol now corresponds to an ordinary field on an ordinary slope, which is, in its own way, a kind of information.