河流 héliú HSK7 river Origin Definitions Defs Strokes Stroke Words Sentences Sents 两河流域 liǎnghéliúyù Mesopotamia The region in West Asia between the Tigris and Euphrates rivers; home to the ancient civilization of Mesopotamia.黄河流域 huánghéliúyù Yellow River basin The drainage area and basin of the [[黄河|黃河|huang2 he2]]