At Ballinvoher in north Cork, a substantial rath, the Irish term for an earthen ringfort, occupies a gentle east-facing slope in pasture, and a second ringfort lies immediately to its south-south-west. Ringforts were the enclosed farmsteads of early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries, and while they survive in their thousands across the country, paired examples in such close proximity are worth a second look.

The Ballinvoher rath is a roughly circular enclosure, measuring about 40 metres north to south and 36 metres east to west. It is defined by an earth and stone bank, heavily overgrown, that rises to around 2.3 metres on the interior and 2.4 metres on the exterior, with an external fosse, essentially a defensive ditch, surviving to a depth of 0.7 metres along the northern, southern and western sides. The entrance is on the north-west, a causewayed gap some 9 metres wide where the ditch was left uncut to allow passage. The eastern portion of the bank has been absorbed into the field fence system over time, and the western side shows signs of quarrying. The interior slopes gently down toward the north-east, with the eastern half thick with briars. Intriguingly, the 1842 Ordnance Survey six-inch map recorded a small circular feature within the interior, marked with hachuring, though its nature is not certain. The neighbouring ringfort to the south-south-west is defined by two fosses with a bank of earth between them, a more elaborate arrangement than its single-fosse neighbour to the north.