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On 17 January 1958, Jiading, Baoshan, and Shanghai County in Jiangsu Province became part of Shanghai Municipality, which expanded to 86,300 hectares. The following December, the land area of Shanghai was further expanded to 591,000 hectares when more surrounding suburban areas in Jiangsu were added: Chongming, Jinshan, Qingpu, Fengxian, Chuansha and Nanhui. In 1960 the urban districts were reduced to 10.
591,000 hectares