Chongqing

The megacity of Brakin

Brakin is the name for the combined cities of Brazzaville, Republic of the Congo, (population 1 million, urban area 1.5 million), and Kinshasa, Democratic Republic of the Congo (population 10 million).

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

Megacities

Megacities are cities with more than 10 million people. Despite the rarity of cities with this many people, there is some dispute over the number of these huge urban areas. Here is my list.

China:
Pearl River Delta City (Guangzhou/Shenzhen/Dongguan) 42 million (details)
Chongqing 31.4 million (details)
Shanghai 20 million
Beijing 18 million
Tianjin 12 million

Other Asia:
Tokyo, Japan 34.2 million
Seoul, Korea 24.5 million
Delhi, India 23.9 million
Mumbai, India 23.3 million
Manila, Philipines 20.1 million
Karachi, Pakistan 16.9 million
Osaka, Japan 16.8 million
Kolkata, India 16.6 million
Dhaka, Bangladesh 14 million
Tehran, Iran 13.1 million

Africa:
Cairo, Egypt 15.3 million
Lagos, Nigeria 12.1 million

Europe:
Moscow, Russia 14.8 million
Istanbul, Turkey 13 million
London, UK 12.5 million
Paris, France 10.2 million

North America:
Mexico City 22.8 million
New York City 22.2 million
Los Angeles 17.9 million

South America:
Sao Paulo, Brazil 20.8 million
Buenos Aires, Argentina 14.8 million
Rio de Janeiro, Brazil 12.5 million