Any body that posts with complete anononimity,and feels the need for vulgar attacks on others belief hardly warrents an answer so the following is in respect of those posting after.
as already noted,there are stories of a worldwide flood - worldwide!.
often there are similarities to the biblical version.
as also suggested,they could all be fabricated tales based on a more local disaster.
alternately ,there could be an original true account from which corrupted versions spread out.
you probably guessed that i posit genesis as the original.i believe the bible is Gods word and trustworthy,but realize that others will need much more to even consider that.
i suggest that in comparison of ancient texts,genesis comes out on top.for example,the babylonian describes a sqaure box where-as the box like biblical ark is of a size and dimensions for optimal stability in the worst of seas.
a careful reading reveals disembarkment after the waters had abated .this was confirmed by the first bird returning with a leaf and the 2nd not returning.
this is in line with more recent observation of devastated landscapes recovering faster than would have been thought.