Known in Irish as a rath, a ringfort is an enclosed farmstead of the early medieval period, typically circular in plan and defined by one or more earthen banks and ditches. Tens of thousands of them survive across Ireland, yet each one represents a particular family, a particular patch of ground, and a particular moment in the agrarian life of early Christian Ireland. The one at Doonmore is among the many that have yet to receive detailed public documentation, which makes its presence on the ground all the more worth noting.

The place name Doonmore carries its own archaeological suggestion. Dún mór in Irish means roughly "great fort", and townland names of this kind often indicate that a significant enclosure was prominent enough in the local landscape to become a landmark for naming purposes. Whether the rath in question is the monument that gave the townland its name, or simply a neighbour to some earlier or more substantial feature, is not currently established in the public record. Clare is a county with a dense concentration of prehistoric and early medieval earthworks, and a rath here would sit within a broader pattern of enclosed settlement that shaped the west of Ireland well into the Norman period and beyond.