两河流域 liǎnghéliúyù Mesopotamia Origin Definitions Defs Strokes Stroke Words Sentences Sents 两河 兩河 liǎnghé Mesopotamia Mesopotamia; the historical region between the Tigris and Euphrates rivers流域 liúyù river basin the entire area drained by a river system including its main stream and all its tributaries; drainage area; valley