What survives is a wide, very shallow fosse, essentially a ditch cut into or scraped from the earth, tracing a circuit roughly 34 metres across. There is no wall, no dramatic earthwork, no obvious focal point. Just a faint depression in the land, describing a circle.

Circular enclosures of this kind are among the more quietly common features of the Irish rural landscape, though their purposes varied considerably. Some enclosed early medieval farmsteads, the type usually called a ringfort or rath, and would have sheltered a family, their livestock, and associated outbuildings within a raised bank and external ditch. Others served ritual or ceremonial functions predating Christianity by centuries. Without excavation, it is rarely possible to say which category a given example belongs to, and the Killaghaun site has not, on present evidence, been excavated or closely dated. What can be said is that someone, at some point, thought it worthwhile to define this particular patch of hillside with a boundary, and that boundary has survived, however faintly, long enough to be recorded.