Eridu ā´rĭdo͞o [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 BC A temple discovered there was probably dedicated to the water god Ea.
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