That curve is almost certainly the ghost of an outer earthen bank, the outermost layer of a ringfort that has been slowly losing its shape to centuries of agricultural activity. Ringforts, roughly circular enclosures defined by earthen banks and ditches, were among the most common settlement forms in early medieval Ireland, typically serving as enclosed farmsteads for a single family or small community. This one, in the townland of Burnfort, mid Cork, sits in pasture and still holds its approximate dimensions, around 48 metres north to south and 45 metres east to west, with a surviving bank reaching nearly 1.8 metres in height in places.

When Coleman described the site in 1947, he recorded it as a well-preserved single-ramparted fort some 130 feet in diameter, with visible remains of a fosse, the defensive ditch that would originally have run outside the bank. The Ordnance Survey maps of 1904 and 1935 both show it as a bivallate enclosure, meaning it had two concentric banks or walls, though much of the outer one has since been lost or absorbed into the field boundary. The interior holds a souterrain, an underground stone-built passage or chamber commonly associated with early medieval ringforts, likely used for storage or as a place of refuge. The bank itself has been partially levelled and disturbed, and a plantation of conifers now occupies the enclosed area, which complicates any reading of what remains. The curved field fence to the north, running concentrically about 12 metres out from the main bank, quietly preserves the memory of that vanished second rampart, legible only if you already know what you are looking at.