This roughly triangular enclosure spans 53 metres north to south and 37 metres east to west, following the natural contours of the summit. The defensive wall, now largely collapsed and barely reaching 75 centimetres at its highest point, is most visible on the eastern approach where the terrain is gentler; on the western and southern sides, where the hill drops away steeply, the stonework has all but melted into the landscape.

The site reveals several intriguing features that hint at its long history of use. An external fosse guards the northeastern approach, whilst what appears to be an ancient roadway leads to the site from the northwest. At the highest point within the enclosure, in the southeastern corner, stands a cairn that later served as a trigonometrical station in the early 20th century, as noted by surveyor Boyle-Somerville in 1909. Against the northern section of the interior wall, archaeologists have identified a small subcircular structure measuring 5 by 2.5 metres, constructed from a single course of stones.

Beyond the main enclosure, the hillside holds further mysteries. Four small stone circles, each roughly 3 metres in diameter, dot the eastern slope between the cashel and the hill’s secondary summit; Boyle-Somerville recorded six such circles during his survey, suggesting others may have been lost over time. The uneven interior of the cashel slopes from west to east, its surface bearing the subtle marks of centuries of occupation and abandonment. This hilltop fortress, whether built for defence, ceremony, or both, remains a testament to the strategic importance of this commanding position overlooking the waters of Lough Swilly.