A ringfort, or rath, once occupied a south-east-facing slope here in gently rolling farmland, its banks and ditches surviving long enough to be mapped across several editions of the Ordnance Survey before being levelled in 1984. What the ground now holds is essentially a memory recorded in cartography rather than in earth.

Ringforts are roughly circular enclosed settlements, most commonly associated with the Early Medieval period in Ireland, typically dating from around the fifth to the twelfth century. They range from simple single-banked enclosures to more elaborate bivallate or trivallate examples, the latter terms simply meaning two or three concentric banks and ditches. The Neddans fort fell into the more substantial category. The first Ordnance Survey map of 1840 shows a roughly circular enclosure, approximately 28 metres north to south and 24 metres east to west, with an external field boundary already encroaching on its western side. By the time of the 1907 edition, the monument was recorded as a bivallate enclosure, though the eastern side appeared to be cut across by a field boundary. The 25-inch OS map adds more structural detail: an inner bank with an internal diameter of around 25 metres, a wide fosse (a defensive ditch), and an outer bank bringing the overall diameter to approximately 44.5 metres. That sequence of maps charts both the monument's form and its slow attrition before the final levelling.

Some 30 to 40 metres to the north-east of the former ringfort there is a souterrain, an underground stone-lined passage or chamber of the kind frequently found in association with Early Medieval settlements and believed to have served for storage or refuge. Unlike the ringfort itself, this feature retains its own separate record. The juxtaposition of the two, a vanished enclosure and a surviving underground structure nearby, is a reminder of how unevenly the past survives, and how much of what was once a coherent inhabited landscape now exists only in the documentary record.