It stands just under a metre and a half tall, roughly subrectangular in cross-section, and its long axis is oriented NNE to SSW, a alignment that may or may not be coincidental but is characteristic of many prehistoric standing stones across Ireland. These solitary stones, planted into the ground by communities who left no written record of their reasons, remain among the more enigmatic features of the Irish landscape. They appear singly or in loose groupings, on hilltops and in lowland fields alike, and their purposes are still debated, with explanations ranging from territorial markers to ceremonial focal points to aids in astronomical observation.

The stone at Garranereagh is modest in scale, measuring 1.1 metres by 0.25 metres in plan, which places it towards the smaller end of the standing stone spectrum in County Cork. The county has a particularly dense concentration of such monuments, many of them associated with the Bronze Age, though precise dating of individual stones without excavation is rarely possible. What is clear is that this stone has been sitting in its field long enough to become simply part of the scenery, the kind of feature a passing walker might register only as a gatepost before noticing there is no gate.