are often drawn between the flood waters of these myths and the primeval cosmic ocean which appear in certain creation myths, as the flood waters are described as a measure for the cleansing of humanity, for example in preparation for rebirth. Most flood myths also contain a culture hero, who "represents the human craving for life".
The oldest known narrative of a divinely initiated flood originates from the Sumerian culture in Mesopotamia, among others expressed in the Akkadian Atra-Hasis epic, which dates to the 18th century BCE. Comparable flood narratives appear in many other cultures, including the biblical Genesis flood narrative, manvantara-sandhya in Hinduism, Deucalion and Pyrrha in Greek mythology, also the Cheyenne, Blackfeet and Puebloan traditions.