China's Giga-Cities

A mega city is one with a population of 10 million or more. What do you call a combination of mega-cities? A giga-city. And China has 4.

Yangtze River Delta City. Population: 92 million. Area: 99600 sq. km (38400 sq mi.). Components: Shanghai, Nanjing, Hangzhou, Ningbo, Suzhou, Wuxi, Changzhou, Zhenjiang, Yangzhou, Taizhou, Nantong, Huzhou, Jiaxing, Shaoxing, Zhoushan

Pearl River Delta City. Population: 64 million. Area: about 20,000 sq. mi. Components: Guangzhou, Shenzhen, Hong Kong, Huizhou, Dongguan, Foshan, Jiangmen,Zhongshan, Zhuhai, Macau. "The Shenzhen-Hong Kong Metropolis will become by 2020 the third largest in the world in GDP terms, behind only New York and Tokyo."

Bohai City. Population: 66 million. Area: about 15,000 sq. mi. Components: Beijing, Tianjin, Dalian, Tangshan, Shenyang, Jinan, Qingdao, Weihai

Chongquin City: Population: 32 million. Area: 82400 sq. km. (31800 sq. mi). Components: 19 districts, and 21 counties