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Not forgetting the Egyptians who have a written history that precedes, is co-existent with, and which continues uninterruptedly after the time of the Flood, yet somehow they were unaware of that catastrophic global event.

Egypt: People have become rebellious. Atum said he will destroy all he made and return the earth to the Primordial Water which was its original state. Atum will remain, in the form of a serpent, with Osiris. [Faulkner, plate 30] (Unfortunately the version of the papyrus with the flood story is damaged and unclear. See also Budge, p. ccii.) Link

Not forgetting the Chinese who also have no memory of such a flood.

China The Chinese classic called the Hihking tells about "the family of Fuhi," that was saved from a great flood. This ancient story tells that the entire land was flooded; the mountains and everything, however one family survived in a boat. The Chinese consider this man the father of their civilization. This record indicates that Fuhi, his wife, three sons, and three daughters were the only people that escaped the great flood. It is claimed, that he and his family were the only people alive on earth, and repopulated the world. Link

Not forgetting Natufian, who doesn't know what s/he is talking about.