It is the kind of structure that a tractor could have long since erased, and in one section, along the south-southeast, the bank has indeed been levelled for about five metres, perhaps by centuries of agricultural pressure. That the rest of it remains is quietly remarkable.

The site is a rath, the Irish term for a ringfort constructed from earth rather than stone. These enclosures were built throughout Ireland roughly between the fifth and twelfth centuries and served primarily as farmsteads, the bank and any accompanying ditch marking out a defended homestead for a family of some local standing. Tens of thousands once existed across the island; a great many have been ploughed flat, drained away, or simply absorbed into the landscape. The one at Ballybane belongs to the more modest end of the scale in terms of size, a single-bank enclosure sitting on level ground, the kind of everyday site that shaped the rural geography of early medieval Munster in ways that grand monuments rarely could.