The fosse here has since been re-cut as a drainage channel, so the feature that once served a defensive purpose now serves a quietly agricultural one, still tracing the same line through the ground after perhaps fifteen hundred years or more.

The site is a rath, the commonest form of enclosed settlement in early medieval Ireland, typically consisting of a circular area bounded by one or more earthen banks with corresponding external ditches. This particular example measures roughly 38.6 metres across on its east-to-west axis and around 38 metres north to south, making it a reasonably substantial example of the type. The earthen bank survives on the southern, western, and northern sides, though it is heavily overgrown. Gaps appear at the north and south-east, but neither has been identified as the original entrance. What makes the Dunmadigan site quietly interesting is not any single dramatic feature but its pairing with another rath located approximately 120 metres to the south. Two such monuments in close proximity suggest that whoever inhabited and managed this landscape during the early medieval period was doing so at some scale, though the relationship between the two enclosures remains unclear.