A bullaun is a large rock, usually boulder-sized, into which one or more rounded depressions have been deliberately ground, creating a shallow cup or basin. These hollows were almost certainly carved by human hands, though precisely when, and precisely why, remains a matter of ongoing debate among archaeologists. Some are associated with early Christian sites, others appear to predate Christianity entirely, and the water that collects in their basins has long been regarded in Irish folk tradition as having curative or protective properties.

Bullaun stones are found across Ireland, but their distribution is uneven, and each one carries its own local character and context. The example at Cunnagher is recorded as a monument, placing it within a broader tradition of such stones that cluster particularly around early ecclesiastical enclosures, holy wells, and ancient routeways. Whether the Cunnagher stone was once part of a larger complex, or whether it survives in isolation, is the kind of question that draws people with a genuine interest in the quieter archaeology of the Irish landscape, the sort that does not announce itself with interpretive panels or car parks.