The first edition of the six-inch OS map, produced in the nineteenth century, shows a complete circular enclosure roughly forty metres in diameter sitting in low-lying ground at the base of Checker Hill in Knockaunbrack. By the time the third edition was drawn up in 1930, only the western half remained marked. On the ground today, the enclosure has been absorbed almost entirely into the surrounding farmland, leaving just a modern field wall that curves from south through west to north, tracing what may be the ghost of the original structure.

Circular enclosures of this kind are common features of the Irish landscape, most often interpreted as the remains of ringforts, the enclosed farmsteads that were built and occupied largely between the early medieval period and around the twelfth century. A typical ringfort consisted of a circular earthen bank or stone wall surrounding a domestic settlement, sometimes accompanied by a fosse, or ditch, on the outside. At Knockaunbrack, beneath the modern field wall that has effectively replaced it, possible traces of the original enclosure wall are still said to be visible to a careful eye. The structure is roughly forty metres across on its north-south axis, a scale consistent with a modest but functional early medieval farmstead.