It measures around 110 metres north to south and 115 metres east to west, making it a substantial structure by any measure, yet it attracts little of the attention lavished on more celebrated prehistoric monuments elsewhere in County Clare. What makes it stranger still is that it is not alone: this is one of several prehistoric enclosures clustered on the same plateau, and from this one, a system of mound walls radiates outward into the surrounding terrain, suggesting something more organised and deliberate than a simple boundary.

The construction of the enclosure's walls closely resembles those of a comparable enclosure roughly 1.8 kilometres to the south-east, and that southern example has been dated to the Late Bronze Age, a period running broadly from around 1200 to 600 BC. The similarity in building technique implies the two may belong to the same tradition, possibly even the same phase of activity, though the Rannagh enclosure itself has not been independently dated. The Carran plateau, a high limestone terrain within the Burren, appears to have supported a meaningful concentration of prehistoric activity, and the radiating mound walls associated with this enclosure suggest the site functioned as part of a wider organised system rather than in isolation. Whether those walls marked territorial divisions, managed livestock movement, or served some other purpose remains an open question.