Eridu (āˈrĭdō) [key], ancient city of Sumer, Mesopotamia, near the Euphrates, S of Ur (in present-day S Iraq). Excavations conducted from 1946 to 1949 revealed that Eridu was the earliest known settlement in S Mesopotamia and dated from c.5000 B.C. A temple discovered there was probably dedicated to the water god Ea.
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