The Dunnaval earthen fort is an ancient fortification constructed atop a prominent
esker (a long, winding ridge formed by glacial activity). The fort has been carved directly into the top of this esker, occupying a commanding position midway between Greencastle and
Kilkeel. From this vantage point, it offers strategic views over the surrounding landscape. The earthworks of the fort are significantly older than the nearby
Greencastle Castle, which lies approximately 2.8 miles to the northeast and dates to the medieval period. In contrast, the fort's origins likely trace back to the Iron Age, making it a time-worn relic of early settlement and defence in the region. == References ==