At Lisheennacreagh in County Cork, a small enclosure sits sealed away behind dense commercial forestry, known primarily because a nineteenth-century cartographer thought it worth marking on a map.

What the Ordnance Survey recorded in 1842 was a univallate enclosure, meaning a roughly circular area defined by a single bank and ditch, measuring around 22 metres in diameter. These enclosures are common features of the Irish landscape, most often associated with early medieval settlement, though their dates and functions vary considerably. The hachuring on the OS six-inch map, a technique using short radiating lines to indicate raised ground or earthworks, suggests the bank was still visible and legible to the surveyors at that time. At 22 metres across, this is a modest example, more likely the remains of a small farmstead or ancillary enclosure than anything monumental. The place-name Lisheennacreagh is itself suggestive: "lisheen" is a diminutive of "lios", the Irish word for a fort or enclosure, which hints at a long local awareness of the earthwork's presence.

Since the afforestation took hold, the site has become effectively inaccessible, and there is no practical way to inspect the earthwork on the ground. What remains is the cartographic trace, a small hachured circle on a map made over 180 years ago, preserving the outline of something that the trees have since swallowed entirely.