Somewhere on a south-facing pasture slope at Longstown in County Cork, a circular enclosure roughly 35 metres across once existed, its outline planted with trees and clearly legible enough in the landscape to be mapped by the Ordnance Survey in 1842. Today it has been levelled entirely, leaving no visible surface trace. The trees are gone, the earthwork is gone, and the ground offers no clue that anything was ever there.

The 1842 six-inch Ordnance Survey map is one of the earliest and most detailed records of the Irish landscape, and the fact that this enclosure appears on it, marked as a circular planted area, suggests it was still a recognisable feature at that point. Enclosures of this kind are generally understood to be early medieval ringforts, circular enclosures defined by one or more earthen banks and ditches, which served as enclosed farmsteads across Ireland roughly between the fifth and twelfth centuries. Whether the tree planting on this one was a later ornamental gesture or simply a way of marking a boundary that had already lost its original form is not recorded. A second enclosure survives approximately 140 metres to the east, which at least confirms that this part of Longstown was once a settled and organised landscape, even if one half of that picture has since been erased.