Photographs: Reuters.
As cities expand into mega regions, there is a rapid growth in the population as well. Some of the world's richest cities are also the most populous.
A report by McKinsey Global Institute says that India will have 68 cities by 2030 with a population of over 1 million, 13 cities with more than 4 million people, and 6 megacities with populations of 10 million or more. Here's a list of the world's 15 biggest metropolitan areas, according to Allianz Knowledge.1. Tokyo (Japan)
Metropolitan area: 35.2 million people
City: 12.9 million people
Tokyo, capital city of Japan is the most populous metropolitan area and the world's largest metropolitan economy with a GDP of $1.479 trillion at purchasing power parity in 2008.
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The world's 15 biggest metropolitan areas
Image: Postmen dress as Santa Claus ride on their delivery motorbikes in Seoul.Photographs: Choi Bu-Seok/Reuters.
Metropolitan area: 25 million people
City: 10.4 million people
The Seoul National Capital Area is the world's second largest metropolitan area.
Seoul accounts for 21 percent of the country's GDP and is home to major multinational conglomerates such as Samsung, LG and Hyundai. In 2008, Seoul was named the world's sixth most economically powerful city by Forbes.. . .
The world's 15 biggest metropolitan areas
Image: A view of apartment blocks under construction in Jakarta.Photographs: Crack Palinggi/Reuters.
Metropolitan area: 22 million people
City: 9.6 million people
The capital city of Indonesia, Jakarta is listed as a global city in the 2008 Globalisation and World Cities Study Group and Network (GaWC) research.
Jakarta's economy depends on financial services, trade, and manufacturing. In 2009, 13 per cent of the population had a per capita income of over $ 10,000.. . .
The world's 15 biggest metropolitan areas
Image: Gaurav Sharma, a martial arts trainer, climbs the 45 storey 'Shreepati Arcade' in Mumbai.Photographs: Arko Datta/Reuters.
Metropolitan area: 21.9 million people
City: 14 million people
Mumbai, the capital of Maharashtra, is the most populous city in India, and the second most populous city in the world.
Mumbai is also the richest city in India and accounts for 6.16 per cent of the country's total GDP. As of 2008, Mumbai's GDP is Rs 919,600 crore ($204.15 billion).. . .
The world's 15 biggest metropolitan areas
Image: Pigeons fly inside the Jama Masjid (Grand Mosque) in Delhi.Photographs: B Mathur/Reuters.
Metropolitan Area: 20.9 million people
City: 9.8 million people
One of the fastest growing cities in the world, the capital city of India focuses on industrial sectors like information technology, telecommunications, hotels, banking, media and tourism. It contributes 4.94 per cent to India's GDP.
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The world's 15 biggest metropolitan areas
Image: Families watch the symphony of lights attraction at park in Manila's Makati financial district.Photographs: Cheryl Ravelo/Reuters.
Metropolitan Area: 20.6 million people
City: 11.2 million people
Manila, the capital of Philippines, is the hub of many scientific and educational institutions.
The city is a major political, commercial, cosmopolitan, cultural, educational and transportation centre of the Philippines.. . .
The world's 15 biggest metropolitan areas
Image: A general view of Sao Paulo.Photographs: Paulo Whitaker/Reuters.
Metropolitan area: 20.1 million people
City: 11 million people
One of the richest cities in Brazil, Sao Paulo is also the most important financial centre in Latin America.
Sao Paulo is the 10th richest city in the world and is expected to be the 6th richest in 2025.. . .
The world's 15 biggest metropolitan areas
Image: A rabbit sculpture is carried away from the Ditan temple fair after a snowfall in Beijing.Photographs: Jason Lee/Reuters.
Metropolitan Area: 19.7 million people
City: 13.3 million people
Beijing is a recognised hub of political, educational, and cultural activities.
Beijing is amongst the most developed cities in China with the tertiary industry accounting for 73.2 per cent of its GDP.In 2010, Beijing's nominal GDP reached 1.37 trillion RMB.
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The world's 15 biggest metropolitan areas
Image: Labourers work at a construction site in Shanghai.Photographs: Aly Song/Reuters.
Metropolitan area: 19.2 million people
City: 13.8 million people
Shanghai represents the booming economy of China. The World Expo organized in 2010, attracted 73 million visitors from around the world.
Shanghai is now aiming to be a global finance hub and international shipping centre. The city's total GDP grew to 1.687 trillion RMB ($256.3 billion) with GDP per capita of 76,000 RMB ($11,540).. . .
The world's 15 biggest metropolitan areas
Image: A full moon rises over the skyline of Manhattan along the Hudson River in New York.Photographs: Gary Hershorn/Reuters.
Metropolitan area: 19 million people
City: 8.3 million people
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The world's 15 biggest metropolitan areas
Image: New buildings are seen behind a low-income neighborhood in Mexico City.Photographs: Jorge Dan Lopez/Reuters.
Metropolitan area: 18.7 million people
City: 8 million people
Mexico City is Mexico's largest city and a political, cultural, educational and financial centre.
Mexico City had a gross domestic product (GDP) of $390 billion in 2008, making it the eighth richest city in the world. The city was responsible for generating 21 per cent of Mexico's gross domestic product.. . .
The world's 15 biggest metropolitan areas
Image: General view of the traffic on a crowded road in Cairo.Photographs: Mohamed Abd El-Ghany/Reuters.
Metropolitan Area: 17.2 million people
City: 7 million people
The economy of Cairo was ranked first in the Middle East region and 43rd globally by Foreign Policy's 2010 Global Cities Index.
Cairo, the capital of Egypt has been the centre the nation's commercial activity.. . .
The world's 15 biggest metropolitan areas
Image: Fishermen row a boat on the Hooghly River against the backdrop of Howrah bridge in Kolkata.Photographs: Parth Sanyal/Reuters.
Metropolitan Area: 15.6 million people
City: 5.1 million people
Kolkata is the commercial capital of eastern India, located on banks of the Hooghly river.
The Kolkata metropolitan area, including suburbs, has a population of over 15 million making it the third most populous metropolitan area in India. Kolkata served as the capital of India during the British era till 1911.. . .
The world's 15 biggest metropolitan areas
Image: Ringling Bros and Barnum Bailey circus elephants during their walk to Staples Center in LA.Photographs: Reuters.
Metropolitan area: 14.7 million people
City: 3.8 million people
The entertainment capital, of the world is the most populous city in California and the second most populous in the United States.
Los Angeles has been ranked the third richest city and fifth most powerful and influential city in the world, behind only New York City in the United States.
The Los Angeles combined statistical area (CSA) has a gross metropolitan product (GMP) of $831 billion (as of 2008).. . .
The world's 15 biggest metropolitan areas
Image: A general view of the Kievski Station and Yevropeski shopping centre illuminated before Earth Hour.Photographs: Alexander Natruskin/Reuters.
Metropolitan area: 13.7 million people
City: 10.5 million people
Moscow is one of largest city economies in Europe and it accounts for 24 per cent of Russia's GDP.
Moscow is the financial centre of Russia and home to the country's largest banks and many large companies.
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