It is a rath, the Irish term for a ringfort, and ringforts are among the most common archaeological monuments in the Irish countryside, yet familiarity has done little to diminish their quiet strangeness. These were the enclosed farmsteads of early medieval Ireland, roughly the fifth to twelfth centuries, their circular banks and ditches defining a domestic space where families kept livestock, stored grain, and went about lives that are now almost entirely beyond recovery.

The Burren is limestone country, a landscape of grey karst pavements and thin soils where the rock sits close to the surface and the light in certain seasons has an almost mineral quality. Ringforts in this part of Clare tend to occupy ground that commanded a view or offered some natural advantage, and the townland name Ballynalackan, from the Irish meaning something close to the town of the flagstones, suggests a place long defined by the character of its terrain. The nearby Ballynalackan Castle, a tower house with origins in the fifteenth century and associated with the O'Brien family who dominated this part of Thomond, gives some sense of the long human attention this corner of Clare has received across successive centuries. The ringfort, though, predates all of that by many hundreds of years, a feature of the landscape that tower house builders would themselves have known and walked past.