The site consists of an oval enclosure measuring between 10 and 16.8 metres in internal diameter, its boundaries marked by a heavily collapsed stone wall. A small gap, roughly 0.7 metres wide, breaks the eastern section of the wall, possibly marking an original entrance or a later breach in the structure.

What makes this particular cashel intriguing is evidence of its reuse through different periods. Along the northeastern, eastern and southeastern sides of the enclosure, circular stone foundations suggest later inhabitants repurposed the site, perhaps building small dwellings or storage structures within the protective embrace of the ancient walls. This layering of history is common across Ireland’s archaeological landscape, where successive generations often built upon and adapted earlier settlements to suit their needs.

The cashel stands amidst rough pasture, a testament to the enduring presence of these defensive homesteads throughout the Irish countryside. These structures, typically dating from the early medieval period (roughly 500 to 1200 CE), housed farming families and their livestock whilst providing protection from raids and harsh weather. The Mounthall example, documented in the Archaeological Survey of County Donegal in 1983, represents one of thousands of similar sites scattered across Ireland, each telling its own story of settlement, defence and adaptation through the centuries.