It is the kind of monument that appears on maps as a faint outline, a curve of earthwork or stone that marks a boundary drawn long ago, its original purpose still waiting to be set down in any publicly available form.

Enclosures of this kind are among the most common and most varied archaeological features in the Irish countryside. They range from early medieval ringforts, which served as farmsteads enclosed by an earthen bank and ditch, to later field boundaries, ecclesiastical enclosures surrounding early church sites, and prehistoric settlement traces. Without more specific detail attached to this particular site, it is difficult to say which category it falls into, or what period it belongs to. Creggagh as a place-name has roots in the Irish word creagach, meaning rocky or abounding in rocks, which hints at the kind of terrain these enclosures often occupy, land that was marginal, exposed, and shaped by centuries of use rather than dramatic intervention. Mayo is dense with such features, many of them still unexcavated and understood only in outline.