The stone at Annagannihy was absent from both the 1842 and 1904 OS six-inch maps, meaning it went unrecorded by the most systematic cartographic efforts of its era, sitting in its field while surveyors passed it by. It is a modest thing physically, rising to 1.5 metres in height and measuring roughly 0.4 by 0.7 metres across, subrectangular in plan with its long axis running east to west. It stands on a south-west-facing slope in rough grazing land, and it is not alone: another standing stone sits approximately 45 metres to the south-east.

Standing stones are among the most common and least understood prehistoric monuments in Ireland. They were erected, most likely during the Bronze Age, for purposes that remain genuinely unclear, though associations with burial, land marking, and astronomical alignment have all been proposed at various sites. What makes the Annagannihy example quietly interesting is that pairing. Two stones set within 45 metres of each other on the same slope suggest some deliberate relationship, though whether that was functional, ceremonial, or territorial is impossible to say with confidence. The fact that neither appeared on nineteenth or early twentieth century maps hints that both may have been partially obscured, fallen, or simply overlooked by surveyors working quickly across a large rural county.