The rath at Lissaniska East is easy to miss at first glance, absorbed as it is into the rhythms of a working agricultural landscape, yet its proportions are precise enough to suggest real intent on the part of whoever laid it out. Roughly 40 metres across in both directions, the enclosure is defined by an earthen bank and, running along the southern and western edges, an external fosse, the ditch that once gave the whole structure its defensive and social meaning.

Ringforts, known in Irish as raths when they are earthen rather than stone-built, were the standard form of enclosed farmstead in early medieval Ireland, broadly from the sixth to the twelfth century. They functioned as homesteads for farming families of some local standing, the bank and fosse marking a boundary between the domestic interior and the wider world as much as they offered any serious military protection. The one at Lissaniska East retains a good deal of its original form. The bank stands 2.2 metres high on its outer face, dropping to 0.75 metres internally, and the fosse reaches a depth of 1.7 metres with a width of around 2.8 metres. A break in the bank on the north-eastern side is recorded as a recent construction rather than an original entrance, and the bank itself has been levelled along the eastern to south-eastern arc, most likely through agricultural activity over many generations. A field boundary now follows the outer line of the fosse on the south-east to western side, while a boundary that once ran along the northern edge of the site has since been removed. The survey was compiled by Denis Power.

The site sits in level pasture and the interior remains under rough grass, which means there is little to see underfoot, but the earthwork itself rewards a slow walk around its perimeter. The surviving height of the outer bank on the southern and western sides gives a good sense of how commanding even a modest rath would have appeared to anyone approaching across flat ground. Because the surrounding land is agricultural, access requires consideration of land ownership and seasonal grazing; there is no formal public access recorded. The eastern section of the bank being worn lower than the rest makes the original circuit easier to read from the more intact southern and western stretches, so that is where the underlying geometry of the place becomes clearest.