I don't think there is any great mystery. There are multiple possibilities of actual floods, all of which could give rise to flood stories.
In addition there are multiple possibilities of flood stories being told and re-told in various ways.
If there were as few as five actual floods per continent (on average), there could easily be hundreds of flood stories.
It would be an interesting exercise to try and draw up a family tree of flood stories to see how many different types of flood stories there are and which ones were derived from earlier versions. One might also uncover hybrid versions in which a flood story from one family borrows elements of a flood story from a different family.
(See below comment to Mallon about other natural disasters.)
(Have you looked into memes?)
Which memes? L. Ron Hubbard's or Dawkins'? (IOW, the science fiction idea, or the scientific idea? I can barely tell a difference.
Who says they are coincidences? Most human settlements are located on water of some type. Riverbanks swell and tidal waves break, so it's hardly surprising that there should be so many flood accounts.
(There are also many accounts of earthquakes around the world throughout history. This doesn't mean that at one point, there was a global earthquake.)
That's a good point about people living by water, but I've wondered, are there any near-extinction myths involving earthquake, volcano, fire, tornado, plague, etc.? If the flood stories were based on actual events, they could have been based on various types of events, but they're not various; they all involve water and flooding.
Also, could you please provide the wiki article you referred to?
Deluge myth - Wikipedia, the free encyclopedia
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