The spread (or hyper-diffusion) of all humanity from a single West-Asian location is a shared feature of the Genesis Flood account for all three Abrahamic faiths. Within the sphere of ideational cognitive archaeology, we test the predictive thesis that given a global Flood event coinciding with the beginnings of human recivilization, an enormous cultural-religious footprint or worldview relic should be discernible. Visual riddles, forming part of a transcultural solar koine (or shared royal-priestly language), have recently begun to be deciphered by secular academics. Focusing chronologically upon two themes within this solar koine—the cosmic mountain and associated solar symbology—we conclude that only a Flood koine (with a distinctive and historic world navel) can fully explain the close-knit pattern of evidence found across material cultures. The landing place of Noah's Ark is identified with the cosmic mountain. Wide-ranging implications of the koine for our interpretation of The Babylonian Map of the World, together with the search for Noah's Ark, are subsequently explored. One geographical location is recommended for further investigation based upon its exact morphological and landscape correspondence to Flood koine descriptions.