This type of site, sometimes called a promontory fort, takes advantage of natural geography as a defensive strategy: builders needed only to construct a rampart or earthen bank across the landward approach, leaving the sea and the cliff face to do the rest of the work on the remaining sides. It is an arrangement found at various points around the Irish coastline, but each example occupies its own particular relationship with the terrain, and the one at Dunowla carries the quiet distinction of a place that has largely been left alone by the historical record.

Beyond its classification as a cliff-edge fort and its location in County Sligo, the documentary evidence currently available for this site is thin. What can be said with confidence is that cliff-edge and promontory forts in Ireland generally date from the Iron Age, though some were used across a much longer span, and their construction reflects a sophisticated reading of landscape. Whoever chose the ground at Dunowla understood the value of height, exposure, and the natural barrier of the Atlantic. Sligo's coastline is dramatic in places, shaped by the same geology that produced the flat-topped profiles of mountains like Benbulben inland, and a fort positioned on its cliffs would have commanded considerable views over the water and any approach from the sea.