What survives at Lisnamoltaun is a rath, the commonest form of early medieval Irish settlement, essentially a farmstead enclosed by one or more earthen banks and an outer ditch. This one measures roughly 24.5 metres across, modest even by the standards of the type, and only portions of its original form remain legible in the landscape.

The enclosure was once defined by a bank and an external fosse, the ditch that would have been dug to throw up the bank material in the first place. Today, the bank can still be traced from the north-east around to the south, and again from the west to the north, but elsewhere the boundary has eroded to little more than a scarp, a slight slope in the ground where a more deliberate structure once stood. Faint traces of the fosse survive in corresponding arcs. Several gaps have been cut through the earthwork at some point, and small quarries have disturbed parts of the site further. More intriguing is what may lie beneath the interior: a probable souterrain, an underground stone-lined passage or chamber of the kind frequently associated with raths, used variously for storage, shelter, or refuge during the early medieval period. A house stands roughly 100 metres to the south-south-west, a reminder that this land has remained in use long after the original enclosure lost its meaning.

The site is not signposted or formally managed, and its worn condition means that what is visible on the ground requires some patience to read. The surviving earthworks are most legible when low vegetation and low-angle light allow the slight changes in ground level to register clearly, typically in late autumn or winter.