Flood myths are common across a wide range of cultures, extending back into Bronze Age and Neolithic prehistory.
One "flood myth" in Egyptian mythology involves the god Ra and his daughter Sekhmet.
Ra sent Sekhmet to destroy part of humanity for their disrespect and unfaithfulness which resulted in the gods overturning wine jugs to simulate a great flood of blood, so that by getting her drunk on the wine and causing her to pass out her slaughter would cease.
As such, to them this demonstrates the veracity of the Japanese creation myth, where Japan comes first and foremost.
There are many folktales among Tai peoples, included Zhuang, Thai, Shan and Lao, talking about the origin of them and the deluge from their Thean (แถน), supreme being object of faith.