Measuring roughly ten and a half metres long by four and a half metres wide, it is too orderly to be accidental, yet too worn and undated to be easily explained. What it was, precisely, is still an open question.

A rath, to give the ringfort its Irish term, is a circular enclosure defined by an earthen bank and ditch, typically associated with early medieval farmsteads in Ireland. They were the defended homesteads of farming families, and the interior space was often occupied by a dwelling and ancillary buildings. The structure at Prospecthill may represent exactly that kind of domestic arrangement. McCaffrey, writing in 1952, noted it as a possible associated house site within the rath, and the description has remained cautious ever since. The drystone walls survive only at low height, and no dating evidence appears to have been securely attached to the structure. It belongs to that particular category of Irish field monument that archaeology can describe in outline but not yet fully explain.