A megalopolis (sometimes called a megapolis; also megaregion, or supercity) is typically defined as a chain of roughly adjacent metropolitan areas. The term was used by Patrick Geddes in his 1915 book Cities in Evolution, by Oswald Spengler in his 1918 book The Decline of the West, and Lewis Mumford in his 1938 book The Culture of Cities, which described it as the first stage in urban overdevelopment and social decline. Later, it was used by Jean Gottmann in his landmark 1961 study, Megalopolis: The Urbanized Northeastern Seaboard of the United States, to describe the chain of metropolitan areas along the northeastern seaboard of the U.S. extending from Boston, Massachusetts, through New York City, Philadelphia, Baltimore, and ending in Washington, D.C. and Northern Virginia. The latter is sometimes called the "BosWash megalopolis".
Megalopolis is a Western deformation of the Greek word that derived from Greek: μέγας - 'great' and Greek: πόλις - 'city', therefore literally a 'great city'. This term is closer in meaning to megacity. Because in Greek, πόλις is feminine, the correct term is megalopolis.
A megalopolis, also known as a megaregion, is a clustered network of cities. Gottmann defined its population as 25 million. Doxiadis defined a small megalopolis a similar cluster with a population of about 10 million. America 2050, a program of the Regional Plan Association, lists 11 megaregions in the United States and Canada. Literally, megalopolis in Greek means a city of exaggerated size where the prefix megalo- represents a quantity of exaggerated size. Megapolitan areas were explored in a July 2005 report by Robert E. Lang and Dawn Dhavale of the Metropolitan Institute at Virginia Tech. A later 2007 article by Lang and Nelson uses 20 megapolitan areas grouped into 10 megaregions. The concept is based on the original Megalopolis model.
Modern interlinked ground transportation corridors, such as rail and highway, often aid in the development of megalopolises. Using these commuter passageways to travel throughout the megalopolis is informally called megaloping. This term was coined by Davide Gadren and Stefan Berteau.
Cairo–Giza–Qalyubia–Helwan–6th of October City (Greater Cairo), Egypt (16 million) The area around the Nile is also very densely populated.Nile River Delta Governorates (Alexandria, Beheira, Kafr el-Sheikh, Gharbia, Monufia, Qalyubia, Dakahlia, Damietta, Al Sharqia, and Port Said) have a combined population of 41,045,135. The total area of these Governorates is 18,199 square miles making the population density 2,255.4 per square mile.The Gauteng City Region (PWV) in South Africa, which includes the urbanised portion of Gauteng Province (Pretoria, Centurion, Midrand, Johannesburg and the Vaal Triangle, with a population of over 10 million)The region in Morocco including El Jadida-Casablanca-Rabat-Salé-Kenitra, concentrating in the long coastal belt, on around 250 km with a depth of 40 to 50 km, more than 11 million inhabitants.The Nairobi Metropolitan Region consisting of the counties of (Kajiado-Kiambu-Nairobi-Machakos-Murang'a) in Kenya, which have a combined population of 8 million people.Pearl River Delta Megalopolis (珠江三角洲): (Hong Kong, Shenzhen, Dongguan, Guangzhou, Foshan, Jiangmen, Zhongshan, Zhuhai, Macau, Huizhou) (55,000,000), if Shantou/Quanzhou added (Guangdong Megalopolis) 70,000,000. If other areas added, 120,000,000.Yangtze River Delta Megalopolis (長江三角洲): (Shanghai, Nanjing, Hangzhou, Ningbo, Suzhou, Jingjiang, Wuxi, Changzhou, Zhenjiang, Yangzhou, Taizhou, Nantong, Huzhou, Jiaxing, Shaoxing, Jiangyin, Haimen, Zhangjiagang, Zhoushan, Ma'anshan) (88,000,000)Bohai Economic Rim (环渤海经济圈): Beijing, Tianjin, Dalian, Anshan, Fushun, Dandong, Sinuiju, Tangshan, Yantai, Shenyang, Jinan, Qinhuangdao, Qingdao, Weihai (66,400,000)South China Coast : Xiamen, Fuzhou, Wenzhou, Shantou, Jieyang, Chaozhou (25,000,000)Central Plain (中原): Kaifeng, Xinxiang, Zhengzhou, Luoyang (14,170,000)The central Liaoning city cluster in China. Within 150 km from its center Shenyang (7.2 million), it has Fushun (3 million), Anshan City (3.6 million), Benxi (1.5 million), Liaoyang (1.8 million), Yingkou (2.2 million), Panjin (1.2 million), and Tieling (3.4 million), with a total population of 23 million. And it can be further extended to Dalian (6.2 million), Fuxin (2 million) and Dandong (2.4 million). This area used to be the most industrialized region in China. It declined during 1980s-1990s, but in recent years, it has rapidly revived.Northeastern Cities or the Harbin–Changchun Area (哈尔滨长春地区): Harbin, Qiqihar, Daqing, Changchun, Jilin City, Siping including Rason in North Korea and Vladivostok in Russia (21,832,000)Sichuan basin (四川盆地) or the Chengyu Megalopolis (成渝都市圈): Chengdu, Chongqing, Zigong, Luzhou (20,878,000)Greater Wuhan Megalopolis (大武汉都市圈): Wuhan, Huangshi, Xinyang, Jiujiang, Yueyang (20,000,000)Guanzhong (关中): Xi'an, Xianyang, Baoji, Weinan (16,722,000)Greater Changsha Metropolitan Region (长株潭城市群): Changsha, Zhuzhou, Xiangtan (12,994,400 in 2000)In July 2012, the Economist Intelligence Unit brought out a report entitled; Supersized cities: China’s 13 megalopolises, which pinpoints the 13 emerging megalopolises in China, and highlights the demographic and income trends that are shaping their development.
Taiheiyō Belt – Ibaraki, Saitama, Chiba, Tokyo, Kanagawa, Shizuoka, Aichi, Gifu, Mie, Kyoto, Osaka, Hyōgo, Wakayama, Okayama, Hiroshima, Yamaguchi, Fukuoka, and Ōita in Japan. (81,859,345) Seoul National Capital Area - Seoul, Incheon, Suwon, Goyang, Yongin, Seongnam, and the rest of Gyeonggi-do: (25,000,000)Maharashtra - 1.Mumbai (also includes Thane, Navi Mumbai(including Panvel), Kalyan-Dombivali, Ulhasnagar, Vasai-Virar, Ambernath and Badlapur, 2.Pune (also includes Pimpri-Chinchwad), Aurangabad, Solapur, Nashik, Ahmednagar, Alibag (39,500,000)Bengaluru, Chennai, Hyderabad, Kochi, Mysuru, Coimbatore, Visakhapatnam, Madurai and Thiruvananthapuram (38,000,000) (Although widely separated geographically)Delhi National Capital Region and Jaipur (35,000,000)Kolkata Belt- Kolkata (Also includes the suburban areas of kolkata Barrackpore, Dum Dum, Bidhannagar, Naihati, Kanchrapara, Kankinara, kalyani, Rajarhat, Ichapore, Halisahar and Howrah), DankuniGujarat - Ahmedabad, Gandhinagar, Surat, Vadodara, Rajkot, Anand, Nadiad, Bharuch, Ankleshwar (19,200,000)- Dhaka (Greater Dhaka Megalopolis consists four city Corporations: Dhaka South, Dhaka North, Gazipur, and Narayanganj and five municipals: Savar Upazila (A class), Dohar Upazila (A class), Dhamrai Upazila (A class), Tongi (Special Class), Sonargaon (B class) (17,000,000)
- Chittagong (40,09423)
Karachi comprises six district municipal corporations. The total population is 24 million according to the 2011 estimate.
Kathmandu valley, which consists of 5 municipalities namely Kathmandu, Lalitpur, Bhaktapur, Kirtipur and Madhyapur Thimi, along with the peripheral cities of Banepa, Panauti and Dhulikhel.
Mega Manila is made up of 4 Regions:
Central Luzon (11,218,117)Metro Manila (12,877,253)Calabarzon (14,414,774)Mimaropa excluding Palawan (2,113,891)(Regional Centers) San Fernando-Manila-Calamba-Calapan
Total Population of Mega Manila as of 2015: (40,624,035)
Thailand, Malaysia, Singapore, and Vietnam
Central-Thai Bangkok–Ayutthaya–Pattaya (16,000,000)Malaysia Kuala Lumpur–Selangor–Seremban (8,000,000)Sijori Johor Bahru–Singapore–Batam–Bintan (9,000,000)Red River Delta in Vietnam (Hanoi, Hai Phong, Nam Định, & Hải Dương) (10,000,000)Greater Tehran: A region located in Iranian Tehran and Alborz Province in central Northern Iran with its influence expanding in Qom Province, Qazvin Province and Mazandaran Province, home for at least 15 million people, it is one of the most populous urban areas in the Greater Middle East and the surrounding regions. Tehran was a small village 200 years ago when it was first chosen as the Capital city and it has been growing at a very fast rate.(all figures extrapolated from end of 2014 and end of 2015 figures of, to middle of year 2016)
Greater Istanbul: Includes Istanbul city proper, with continuous urbanization spilling over to neighboring provinces, as well as nearby dense population and highly industrialized areas. Istanbul, eastern counties of Tekirdağ province, entire coast of Izmit bay, and Adapazarı add up to 17.5 million population.Other major cities: Ankara (5 million), Izmir (includes satellites Torbalı-Aliağa-Urla-Manisa to add up to 4 million), Adana-Tarsus-Mersin (3 million), Bursa (2.1 million)Netherlands, Belgium & Luxembourg:
Constituent urban areas of each megalopolis are based on reckoning by a single American organization, the Regional Plan Association (RPA). The RPA definition of the Great Lakes Megalopolis includes some Canadian metropolitan areas with the United States, including some but not all major urban centres in the Windsor-Quebec City Corridor. Note that one city, Houston, is listed in two different Megalopolis regions as defined by the RPA, (the Gulf Coast and Texas Triangle).
The following megaregions in Colombia are expected to have nearly 93% (55 Million people) of its population by 2030, up from the current 72%. There are currently 4 major megaregions in Colombia.
Other sources show that another megaregion may be considered:
