It exists, officially, as a classified archaeological site; what it actually consists of, how old it might be, and what shape it takes on the ground are questions that the surviving record has not yet answered in any publicly available form.

Enclosures of this kind are among the most common monument types in the Irish landscape. The term covers a broad range of features, from the circular earthen banks of a ringfort, a defended farmstead of the early medieval period, to the ditched boundaries of a prehistoric settlement or a simple field enclosure of uncertain date. Lismoran itself is a Gaelic place name, and townlands bearing such names frequently preserve traces of occupation stretching back many centuries, with earthworks sometimes surviving as low grassy ridges barely distinguishable from the surrounding pasture. Without more specific detail, it is impossible to say which of these categories the Lismoran enclosure belongs to, or whether any surface trace remains visible at all.