How about a regional flood in the Black Lake area?
Black Sea?
Here is a good link: http://www.religioustolerance.org/ev_noah.htm
The Black Sea scenario is the more likely as the origin for the great flood story that can be ascribed to virtually all religions. For ancient peoples their entire world was the small area with which they were familiar and had travelled. Most people spent their entire lives within a 25-50 mile area. When their part of the world flooded then to them indeed the entire world was flooded.