What looks like an uneven field on approach is in fact a double-banked ringfort, a type of enclosed circular settlement common throughout early medieval Ireland, typically dating to the first millennium AD. The site at Ahane is roughly 37 metres across its east-west axis, enclosed by two earthen banks with a fosse, or ditch, running between them. The inner bank still stands to about a metre in external height, and a causewayed entrance on the eastern side retains fragments of stone facing at the base of the bank on either side, a detail easy to miss in long grass.

What makes this particular rath more layered than most is the evidence of continued use long after its original function had faded. The interior is raised and still carries the faint corrugations of old cultivation ridges. More distinctly, a mound sitting on the southern bank, about two metres high and four metres wide at its base, is the remains of a lime kiln. A lime kiln was a simple but essential piece of rural infrastructure, used to burn limestone and produce quicklime for agricultural liming and building work. This one appears on the Ordnance Survey six-inch map of 1842, meaning the ringfort's bank was being pressed into practical service well into the nineteenth century, its ancient earthwork repurposed as a convenient platform or windbreak. By the 1904 OS edition, the outer bank itself had been absorbed into the field boundary system and is shown as a solid line rather than as an earthwork, a small cartographic record of how thoroughly the landscape had reorganised itself around these older structures. There is also a possible souterrain in the interior, a souterrain being an underground stone-lined passage associated with early medieval settlement, often used for storage or as a place of refuge.