A standing stone that once rose from reclaimed pasture on the southern bank of the Brouen River in Knockaneroe, County Cork, has since been removed entirely, leaving no visible trace at ground level. It is, in the most literal sense, a place where something prehistoric used to be.

Standing stones are among the most enigmatic survivals of prehistoric Ireland, raised variously as boundary markers, memorials, or ritual focal points, though their precise purposes are rarely recoverable. What makes the Knockaneroe example particularly curious is its cartographic history. It does not appear on the Ordnance Survey six-inch maps of 1842 or 1903, suggesting it was either obscured, buried, or simply overlooked during those surveys. By 1943, however, it had been recorded on the OS six-inch map as a single standing stone. Somewhere in the intervening decades it was noted, mapped, and then lost again, this time not to the earth but to deliberate removal. The land around it had been reclaimed for pasture, and the stone did not survive that process intact or in place.