It measures roughly 43.7 metres on its longer axis and just over 20 metres across, oriented broadly west-southwest to east-northeast, and it has survived well enough to be studied, though the bog around it gives little away about what it once enclosed or who built it.

Enclosures of this type are among the more ambiguous features of the Irish archaeological landscape. They could represent the remains of a ringfort, a type of farmstead built predominantly between the sixth and tenth centuries, defined by a raised bank enclosing a roughly circular or oval area of land. At Lisnamoltaun, the bank survives from the western side around to the north, while elsewhere the boundary has been reduced to a scarp, a slope or edge where the ground drops away rather than rising into a proper earthen wall. Two gaps break the perimeter, one at the east-northeast and one at the south-southeast. The east-northeast gap may be original, suggesting this was once an entrance, though nothing in the current condition of the site confirms what lay beyond it.