It sits on ground with a clear view along the Portmagee Channel, the narrow stretch of water that separates the island from the mainland. No physical trace of it remains, and no local memory of it survives either. The map is, in effect, the only witness.

Circular enclosures of this kind are among the most common archaeological features in the Irish landscape. They typically served as enclosed farmsteads or settlement sites, with a bank and sometimes a ditch defining a domestic space, and most date from the early medieval period, roughly the fifth to the twelfth centuries. The one at Ballymanagh followed the same broad pattern, positioned on rising ground in a way that would have offered both a working agricultural setting and a commanding outlook. At some point between its construction and the arrival of the Ordnance Survey teams in the nineteenth century, the site disappeared entirely from the ground, ploughed out or gradually absorbed into the pasture around it. By the time anyone thought to ask, there was nothing left to ask about.