It is all that remains visible of what was once a souterrain, an underground passage or chamber typically built during the early medieval period, often for storage or refuge, and commonly associated with ringforts. What makes this particular example quietly peculiar is not its archaeology but its local memory: according to tradition, a horse was buried in the cave before it was infilled, sealing whatever structural evidence once lay beneath.

The site sits alongside a ringfort, the kind of enclosed farmstead that was the dominant settlement form in early medieval Ireland, usually defined by an earthen bank or, in the west of Ireland, a stone wall known as a cashel. By the time the third edition of the Ordnance Survey six-inch map was drawn up in 1933, only a small open circle marked the northern limits of the cashel's hachures, the fine lines surveyors used to indicate the slope of an earthwork or wall. That modest cartographic symbol is now the clearest formal record that anything was ever there. The story of the horse belongs to a different register entirely, the kind of local explanation that accumulates around a filled-in hollow when nobody quite remembers what it was originally for.