The example at Ballaghfarna in County Mayo is one such site, a rath, which is the Irish term for a roughly circular earthen enclosure, typically defined by one or more banks and ditches, built during the early medieval period, broadly between the fifth and twelfth centuries. These were farmsteads rather than fortifications in any military sense, the raised banks serving to define a family's territory and provide some protection for livestock against wolves and raiders alike.

Ringforts of this kind were the standard unit of rural settlement in early medieval Ireland, and Mayo, with its mix of upland bog and coastal plain, contains a considerable number of them. The place name Ballaghfarna itself is worth a moment's attention. Bealach in Irish generally refers to a pass or road, suggesting the townland may once have sat along a recognised route through the landscape, the kind of detail that quietly reframes how a monument and its surroundings relate to one another. A rath positioned near such a route would have had both practical and social significance, visible to those passing through and connected to the wider network of early medieval life.

The site sits within a landscape that rewards slow attention. Mayo's terrain has a way of preserving earthworks that might have been ploughed away elsewhere, and a rath in this kind of environment can retain its essential shape, the curve of its bank still legible in the grass even after more than a thousand years.