The designation "anomalous" is, in its own quiet way, telling. Ireland's landscape is densely populated with stone monuments, from portal tombs and wedge tombs to stone circles, standing stones, and field boundaries accumulated across millennia. When surveyors encounter something that resists those classifications, the word "anomalous" gets applied, and the site sits in a category of its own, waiting for further investigation or interpretation.

Carheenybaun is a townland in Connemara, a part of County Galway where the ground is largely blanket bog, exposed rock, and rough grazing land. The name itself derives from the Irish, likely containing the element "carraig" or a diminutive form suggesting small rocky ground, and the suffix "baun" from "bán", meaning white or pale. Across this kind of terrain, stones that were moved, arranged, or otherwise worked by human hands can be difficult to distinguish from the natural scatter of glacially deposited rock that characterises so much of the west of Ireland. It is precisely that ambiguity that makes an anomalous classification significant: something about this particular grouping suggested human intention to the people who recorded it, even if the purpose or period remains unclear.