No trace of it can be seen at the surface, which is precisely what makes it interesting. The possible souterrain, a type of underground passage or chamber commonly associated with early medieval ringforts and thought to have served for storage, refuge, or both, remains unconfirmed by any survey. It may be collapsed, concealed, or simply a memory that outlasted whatever originally gave rise to it.

The rath itself sits on a gentle rise in grassland, with bogland stretching away to both north and south, a setting that would have made good practical sense to whoever enclosed this ground. The earthwork is subcircular in plan, measuring roughly 37 metres east to west and 35.5 metres north to south, and is defined by two banks with a fosse, a defensive ditch, running between them. Double-banked examples like this one are less common than single-banked raths and are sometimes taken to indicate a site of slightly higher status, though the precise significance varies. The condition is described as fair, meaning the earthworks survive recognisably but have seen some degradation over the centuries.

The name Lisnageeragh itself contains the Irish word lios, another term for a ringfort, suggesting this particular enclosure was prominent enough in the landscape to anchor the place-name long after whatever community built it had gone. The bogland visible from its banks would once have been a useful resource, managed for fuel and grazing, and the slightly elevated position of the rath above that wet ground speaks to a careful choice of site rather than accident.