Among those earthworks is a large enclosure, the kind of substantial enclosed space that might once have defined a settlement boundary, a ceremonial precinct, or a pastoral boundary, depending on its age and the evidence left within it. The Burren is unusually rich in such monuments, its thin soils and minimal agricultural disturbance having preserved features that elsewhere were long ago ploughed out or built over.

Large enclosures of this type are found across Ireland in various forms, from the broad ringforts of the early medieval period to more ambiguous prehistoric boundaries whose function remains debated. The Burren landscape around Gleninsheen contains monuments spanning several millennia, and the valley itself sits close to Poulnabrone dolmen and a scatter of wedge tombs, suggesting sustained human activity in the area from the Neolithic onward. Without more detailed recorded information about this particular enclosure, including its dimensions, construction method, and any excavation history, its precise date and character remain open questions.