A ring-ditch is essentially the surviving trace of a circular trench, often interpreted as the remains of a prehistoric burial monument or the foundation of a long-vanished timber structure, and this one carries an additional peculiarity: it is open to the north, meaning the circuit is incomplete on that side, which may reflect original design or subsequent disturbance over the centuries.

The ditch occupies the centre of the inner enclosure of a rath, the wider earthwork surrounding it. A rath, sometimes called a ringfort, is a roughly circular enclosed settlement typical of early medieval Ireland, built and occupied broadly between the sixth and twelfth centuries. The presence of a ring-ditch inside a rath rather than standing alone raises questions about sequence and reuse: was the ditch already ancient when the rath was constructed around it, or did both features share some related purpose? A second ring-ditch, recorded separately, is conjoined with the first to the south-east, so the two features meet or overlap, making Linziestown a somewhat unusual cluster of circular earthwork forms within a single relatively flat field. The site is known largely from aerial evidence, which means the crop and soil marks visible from above carry most of the information about what lies beneath.