The second edition of the OS 6-inch map, drawn up in the late 19th century, marks what appears to be the southern half of a ringed enclosure in the townland of Creggan. Today, no trace of this structure remains visible on the ground, leaving only cartographic evidence of its former existence.

The lost enclosure once stood approximately 150 metres west of a surviving ringfort, positioned on a small hillock that commanded sweeping views across the Finn Valley. This strategic placement was typical of early medieval settlements in Ireland, where communities chose elevated sites that offered both defensive advantages and panoramic vistas of the surrounding landscape. The grazing land that now occupies the site shows no indication of the earthwork that once marked this spot.

The incomplete nature of the archaeological record; showing only the southern half of what seems to have been a complete ringed enclosure; raises intriguing questions about when and why the northern portion disappeared. Whether it was destroyed before the Ordnance Survey mapping took place, or whether it represents something more unusual in the archaeological landscape of Donegal, remains unknown. This ghostly half-circle on old maps serves as a reminder of how much of Ireland’s archaeological heritage has been lost to time, agriculture, and development.