Tiamat is a primeval goddess in Babylonian and Sumerian mythology. She is a central figure in the Enuma Elish[?] creation epic.
In Sumerian mythology Tiamat was the goddess of salt water. She, together with Abzu filled the cosmic abyss with the primeval waters.
Enuma Elish (http://www.sacred-texts.com/ane/enuma.htm)
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