It measures roughly twenty-five metres in diameter and sits just below the crest of a ridge, the kind of placement that suggests intention rather than accident. Go looking for it today, however, and you will find nothing. The ground has been levelled, the circle erased, and the pasture rolls on without interruption.

What the 1923 map recorded was most likely a tree-ring, a form of designed landscape feature common to Irish country house demesnes during the eighteenth and nineteenth centuries. Tree-rings were ornamental plantings arranged in a circle, sometimes around a central specimen tree, sometimes following the line of an earlier earthwork, and sometimes simply imposed on the land as a piece of garden geometry visible from the house or from a carriage drive. Cahermoyle House, set in its own demesne in west Limerick, would have been a plausible setting for such a feature. Whether the circular enclosure recorded on the map was purely ornamental, or whether it incorporated or overlay an older earthwork of archaeological origin, was never conclusively established. When Denis Power compiled his assessment in 2011, inspection of the site showed no surviving trace of the monument whatsoever.

The site sits within private demesne land, so access is not straightforward, and in any case there is little to see on the ground. The interest here is cartographic as much as physical: the 1923 six-inch Ordnance Survey sheet preserves the outline of something that has since vanished entirely. For anyone with an interest in how Irish estates shaped and reshaped the land around them, that gap between the map and the field is itself worth pausing over. Landscapes that look natural or accidental often turn out to have been arranged with considerable care, and the absence of a feature can be as telling as its presence.