It is probably no accident that the Sumerians started to build zigguruts to emulate mountains-the thing that may have saved their ancestors from the flood and thus a holy place? It was remembered of course cause the rivers contonued to overflow so it was a constant reminder ofthe big one?
LOL, I suggest you look at a map of the Black Sea. The Tigris and Euphrates flows out of Iraq into the Persian Gulf. The Persian Gulf was completely dry during the Ice Age.