(also Absu, Abzu)
Apsu is a primeval Sumero-Akkadian god, representing the sweet waters underneath the earth (opposite Tiamat, the salt waters of Chaos). Later myths tell that the sweet and salty waters came together with a third element—possibly cloud—and created the first gods. Mesopotamian myths tell that Ea had cast a spell upon Apsu to keep the sweet waters contained underground. (although some myths say that Ea had killed Apsu.)
Mankind was supposedly created from the clay formed by Apsu.