Hengyang hŭng-yäng [key], city (1994 est. pop. 543,100), central Hunan prov., China, on the Xiang River, at the mouth of the Lei River. It is the leading transportation center of Hunan, linking water, rail, and highway routes. Manufactures include chemicals, agricultural and mining equipment, textiles, paper, processed foods, and smartphones. Lead, zinc, coal, and tin mines are nearby. Its former name was Hengzhou (Hengchow).

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