All the places you listed have one thing in common, they are all either on coasts or have major rivers. These types of areas are subject to floods. Couple a severe winter in the mountains where a major river has its source with a tsunami. Where are are the mountain peoples. Ifyour flood covered mountains , that would be a unique occurance and these peoples would have had stories of it. What good is a flood story in a place that normally has floods. The story would have some merit if in a floodless area.
There is no better love between 2 people than mutual respect for each other WT Young, 2002
Who gave anyone the authority to call me an authority on anything. WT Young, 1969
Since Evolution is only ~90% correct it should be thrown out and replaced by Creation which has even a lower % of correctness. W T Young, 2008