This ancient stone fort, measuring approximately 32 metres in diameter, once stood as a formidable defensive structure. Today, visitors can trace the remnants of its collapsed stone wall, which still partially encircles the site, whilst a section of a second wall remains visible in the southwestern sector. A modern field fence now skirts the monument on the northeastern side, and though a gap in the southern wall might indicate an original entrance, centuries of deterioration make this impossible to confirm.

The real intrigue lies beneath the surface, where an extensive souterrain system weaves through the earth. This underground network, now accessible through three openings (none of which appear to be original entrances), features a stone built main passage running east to west that opens into a substantial chamber slightly west of the cashel’s centre. At the point where the floor drops to 1.5 metres below ground level, shorter subsidiary passages branch off to both the east and west, creating a complex subterranean refuge that would have served multiple purposes; storage, hiding, or perhaps ritual use.

Archaeological remains within and around the cashel paint a picture of sustained habitation. Two circular hut foundations can be found northeast and southwest of the souterrain, suggesting domestic structures that once housed the fort’s inhabitants. In the eastern section, a large stone bearing a circular depression hints at possible craft or food preparation activities. Beyond the cashel’s western edge, traces of what may be an ancient field system indicate agricultural activity, reminding us that these weren’t merely defensive structures but thriving settlements where daily life unfolded against the dramatic backdrop of Donegal’s coastal landscape.