The legendary story of Noah’s flood occurred in the year 2348 BCE if you believe Ussher’s biblical timeline he made up in 1654. However, this flood myth is clearly based on the Sumerian flood story documented in the Epoch of Gilgamesh circa 2100 BCE.
The Epoch of Gilgamesh is regarded as one of the earliest surviving notable literature. I think it is interesting to note that the first section of the Epoch of Gilgamesh refers to a time span of 241,200 years prior to the great flood. To me, it is interesting that around the proposed date of the great flood, the people authoring it thought the Earth was at least 241,200 years old. The first section of the Epoch of Gilgamesh lists eight kings who ruled over the five cities of Eridu, Bad-tibiru, Larag, Zimbir and Shuruppag. The section ends with the line “Then the flood swept over.”