It has been identified, mapped, and assigned a monument number, but the details that would normally accompany such a designation, its dimensions, its construction, its probable date, have not yet been made available. It is, in a quiet administrative sense, a known unknown.

Enclosures of this kind in the west of Ireland range widely in origin and purpose. Some are the remains of early medieval ringforts, circular earthwork enclosures that served as farmsteads and settlement sites from roughly the fifth to the twelfth centuries. Others may be ecclesiastical enclosures, marking the boundaries of early Christian sites, or later field systems whose precise function was shaped by the particular pressures of land use in rural Connacht. The townland name Killeen is itself suggestive: deriving from the Irish "cillín", it most commonly refers to a small, unconsecrated burial ground, often used historically for the interment of unbaptised infants or others excluded from consecrated church cemeteries. Whether the enclosure and the place name are directly connected is not something the available evidence can confirm, but the pairing is the kind of detail that tends to linger.