Photographs: Yuriko Nakao/Reuters.
A megacity is a metropolitan area with a total population of over 10 million people. Megacities have made rapid strides in economic development and job creation. Take a look at world's 20 megacities...
1. Tokyo (Japan)
Population: 34.3 million
Tokyo is a major international finance centre, which houses the headquarters of several large investment banks and insurance companies. It serves as a hub for Japan's transportation, publishing, and broadcasting industries.
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3 Indian cities among world's top megacities
Image: Visitors walk through an entrance to China Import and Export Fair, also known as the Canton Fair, in the southern Chinese city of Guangzhou.Photographs: Bobby Yip/Reuters.
2. Guangzhou (China)
Population: 25.2 million
Guangzhou is the main manufacturing hub of the Pearl River Delta, one of mainland China's leading commercial and manufacturing regions.
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3 Indian cities among world's top megacities
Image: Women make traditional Korean side dish kimchi, or fermented cabbage, at a charity event at the Seoul City Hall Plaza.Photographs: Jo Yong-Hak/Reuters.
3. Seoul (South Korea)
Population: 25.1 million
Seoul has become a major business hub. Although it accounts for only 0.6 per cent of South Korea's land area, Seoul generates 21 per cent of the country's GDP.
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3 Indian cities among world's top megacities
Image: Local residents walk pass blossoming cherry trees at Jing An Park in downtown Shanghai.Photographs: Carlos Barria/Reuters.
4. Shanghai (China)
Population: 24.8 million
Shanghai has been one of the fastest developing cities in the world, in the last two decades. It is a 'showpiece' of the booming economy of mainland China.
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3 Indian cities among world's top megacities
Image: Passengers offer prayers before boarding a train at a railway station in New Delhi.Photographs: Adnan Abidi/Reuters.
5. New Delhi (India)
Population: 23.3 million
New Delhi is one of the world's top global cities. It is one of the fastest growing cities in the world and rated as an 'alpha- world city'.
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3 Indian cities among world's top megacities
Image: Commuters walk past the headquarters of Central Bank of India in Mumbai.Photographs: Danish Siddiqui/Reuters.
6. Mumbai (India)
Population: 23 million
Mumbai is the commercial and entertainment capital of India, it is also one of the world's top 10 centres of commerce in terms of global financial flow, generating 5 per cent of India's GDP, and accounting for 25 per cent of industrial output.
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3 Indian cities among world's top megacities
Image: People stand at the emergency stairs in an office building during an earthquake drill in Mexico City.Photographs: Bernardo Montoya/Reuters.
7. Mexico City (Mexico)
Population: 22.9
An 'alpha' global city, Mexico City is one of the most important financial centres in North America. Mexico City urban agglomeration has the eighth richest metropolitan area in the world.
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3 Indian cities among world's top megacities
Image: The Empire State Building is seen with its lights turned off in participation with Earth Hour in New York.Photographs: Allison Joyce/Reuters.
8. New York City (United States)
Population: 22 million
New York is a global hub of international business and commerce and is one of three 'command centres' for the world economy.
The city is a major centre for banking and finance, retailing, world trade, transportation, tourism, real estate and new media.
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3 Indian cities among world's top megacities
Image: Retired Brazilian police officer Andre Luiz Pinheiro, 50, dressed as super-hero Batman, is greeted by a dog in Taubate city, Sao Paulo.Photographs: Roosevelt Cassio/Reuters.
9. Sao Paulo (Brazil)
Population: 20.9 million
Sao Paulo is the largest city in Brazil, the largest city in the southern hemisphere. Sao Paulo has a strong international influence and is considered an Alpha World City.
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3 Indian cities among world's top megacities
Image: Passengers queue as they check-in inside the Ninoy Aquino International Airport in Manila.Photographs: Romeo Ranoco/Reuters.
10. Manila (Philippines)
Population: 20.3 million
Manila has a diverse and multifaceted economy. Manila has the chief seaport of the country.
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3 Indian cities among world's top megacities
Image: Policemen guard a toll road in Jakarta as students and workers protest against increasing fuel prices in Jakarta.Photographs: Beawiharta/Reuters.
11. Jakarta (Indonesia)
Population: 18.9 million
Jakarta is the country's economic, cultural and political centre. Jakarta's economy depends on financial service, trade, and manufacturing.
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3 Indian cities among world's top megacities
Image: Occupy LA protesters stage a rally in front of the Bank of America building in downtown Los Angeles.Photographs: Gene Blevins/Reuters.
12. Los Angeles (United States)
Population: 18.1 million
Nicknamed the City of Angels, Los Angeles is a world centre of business, international trade, entertainment, culture, media, fashion, science, sports, technology, and education. The city is home to seven Fortune 500 companies.
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3 Indian cities among world's top megacities
Image: A man sells dry figs from his cart as another rides past on a bicycle in front of the Karachi Municipal Corporation (KMC) building.Photographs: Akhtar Soomro/Reuters.
13. Karachi (Pakistan)
Population: 17,000,000
Karachi is the largest city, the main seaport and financial centre of Pakistan.
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3 Indian cities among world's top megacities
Image: Osaka.14. Osaka (Japan)
Population: 16,700,000
Osaka is one of the command centres for the Japanese economy. Osaka was the centre of commerce in Japan, especially in the middle and pre-modern ages.
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3 Indian cities among world's top megacities
Image: Labourers fish in a pond near a residential estate under construction in Kolkata.Photographs: Rupak De Chowdhuri/Reuters.
15. Kolkata (India)
Population: 16,600,000
Kolkata is the main commercial and financial hub of East and North-East India and home to the Calcutta Stock Exchange.
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3 Indian cities among world's top megacities
Image: Cairo.16. Cairo (Egypt)
Population: 15,300,000
Besides being the capital city, Cairo is the commercial centre and the largest city in Egypt.
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3 Indian cities among world's top megacities
Image: Buenos Aires.17. Buenos Aires (Argentina)
Population: 14,800,000
Buenos Aires is the capital and largest city of Argentina, and the second-largest metropolitan area in South America, after Greater Sao Paulo.
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3 Indian cities among world's top megacities
Image: Moscow.18. Moscow (Russia)
Population: 14.8 million
Moscow is a major political, economic, cultural, scientific, financial, educational, and transportation centre of Russia.
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3 Indian cities among world's top megacities
Image: Dhaka.19. Dhaka (Bangladesh)
Population: 14 million
Dhaka is the centre of political, cultural and economic life in Bangladesh.
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3 Indian cities among world's top megacities
Image: Workmen stand atop a building under construction on a clear winter's afternoon in Beijing.Photographs: David Gray/Reuters.
20. Beijing (China)
Population: 13.9 million
Beijing is China's political, cultural, and educational centre, and home to most of China's largest state-owned companies.
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