Aerial photography has revealed its form with some precision: roughly 32 metres north to south and 28 metres east to west, the enclosure is subtly distorted from a true circle into something closer to an oval, which is itself an unusual feature worth noting. Sites like this are broadly understood as enclosed areas dating from early medieval Ireland, though without excavation it is difficult to say with certainty what purpose any individual example served, whether domestic, agricultural, or ritual.

What makes the Milltown enclosure quietly interesting is its relationship to the surrounding landscape. It sits on poorly drained land, the kind of ground that would have been awkward to work and manage, and yet someone chose to mark and enclose it. A drainage or water channel running east to west cuts across the northern quadrant of the enclosure, complicating its outline and suggesting that later land management has disturbed at least part of the original form. Some 210 metres to the north lies a ringfort, a type of circular earthwork enclosure that served as a farmstead during the early medieval period, broadly between the fifth and twelfth centuries. The proximity of the two features raises the possibility of a relationship between them, though the nature of any such connection remains a matter of inference rather than established fact.