On the western and northern sides there is a low earthen bank; the northern and eastern arc is held by a scarp, a natural or cut slope face, rising to about 1.8 metres; and the eastern to southern edge follows an existing field boundary. The result is a form that reads, at a glance, more like a fold in the land than a deliberate construction.

This is a rath, the Irish term for a ringfort, the most common monument type surviving in the Irish countryside. Ringforts were enclosed farmsteads, built and occupied mainly during the early medieval period, roughly between the fifth and twelfth centuries, and used as homesteads by farming families of varying social rank. They are typically circular, defined by one or more earthen banks and ditches, and would originally have contained timber buildings, animal pens, and other domestic structures within. The Killinga example has one detail that quietly distinguishes it: the interior cuts into the hillslope on the south-western side, meaning the builders deliberately terraced into the gradient to create a level or near-level floor. This kind of hillside adaptation is not unusual among ringforts, but it gives the site a relationship with its terrain that is easy to overlook until you are standing inside it and notice the ground rising sharply behind you.