This subcircular enclosure, known locally as the hut site at Leargain Riach, consists of a ruined stone wall that has partially been incorporated into a modern field wall on its eastern side. The original entrance appears to have been a carefully constructed 2.45 metre gap, marked by two stone slabs set perpendicular to the main wall; a deliberate architectural feature rather than later damage.

The interior of the cashel slopes downward from south to north, with a natural ridge of rock running east to west across the southern portion. Archaeological surveys have identified the foundation of a small subcircular structure, roughly 3.5 metres across, on the eastern side of the enclosure, likely the remains of a dwelling or storage building. The strategic placement of this fortified settlement becomes clear when considering its defensive position: the knoll drops sharply four to five metres on the southern and eastern approaches, whilst the northern and western sides offer gentler slopes.

Today, the site is surrounded by light pasture interspersed with rocky outcrops, much as it might have appeared centuries ago. This archaeological feature was documented in the comprehensive 1983 Archaeological Survey of County Donegal, which catalogued field antiquities from the Mesolithic period through to the 17th century, providing invaluable insights into Ireland's ancient settlement patterns and defensive structures.