Adding on to my last post:
Flood stories pervade hundreds of cultures and there are striking similarities to many of the accounts. It seems that at least some of these stories could be based upon actual events. Geologists have proposed the possibility of a great flood in the Middle East at the end of the last Ice Age, which was about 7,000 years ago. At that time, the Black Sea was a freshwater lake surrounded by farmlands.
The hypothesis is that the European glaciers melted and the Mediterranean Sea overflowed with a force that was 200 times greater than Niagra Falls. That would be an incredibly fast-moving wall of floodwater. There is physical evidence that supports this theory, including stone age structures under the Black Sea.