What makes it worth a second look is precisely what it lacks: despite being otherwise well-preserved, no trace of an original entrance survives, which means the gap through which early medieval families, livestock, and daily life once passed has been entirely absorbed by time and soil.

The monument is a rath, the Irish term for a ringfort, the most common type of early medieval settlement in Ireland. Typically dating from roughly the sixth to the twelfth century, raths were enclosed farmsteads, home to a single family and their animals, defined by one or more earthen banks and ditches. At Kylebeg, the enclosure measures approximately forty metres in diameter, a modest but respectable size. The surrounding bank is about four and a half metres wide, standing roughly one metre above the interior and one metre above the exterior ground level. Beyond it runs an external fosse, or ditch, nearly six and a half metres wide, running from the south around to the north-west. That partial arc of the fosse is notable in itself; it suggests either that the northern and eastern sections have been lost to later agricultural activity, or that the original design was never completed on all sides.