Берешит 9:19 Каббала: Zohar

Consider this. From the day that the world was created, Noah was the first man fitted to be joined in union with the ark and to enter it, and until they were joined the world had not yet reached a stable condition. But once this had happened we read “From these all the earth was overspread” (Gen. 10, 32). These words are analogous to the expression “And from thence the river parted” (Ibid. 2, 10), of the Garden of Eden, which indicate that from this point there was a parting and diffusion of progeny into all quarters of the world.