America
In the United States, the urban area formed by Boston, Providence "Providence (New York)"), Hartford, New York, Philadelphia, Baltimore, Washington D.C. and other smaller metropolitan areas, known as BosWash or the Northeast Corridor, the most populated and extensive area in the Western Hemisphere (65 million inhabitants).
The cross-border megalopolis between the United States and Canada of the Great Lakes region, which brings together the metropolitan areas of Green Bay, Milwaukee, Chicago, Fort Wayne, Toledo "Toledo (Ohio)"), Detroit, Cleveland, Erie "Erie (Pennsylvania)") and Buffalo "Buffalo (New York)") in the United States and Niagara Falls "Niagara Falls (Ontario)"), Toronto, Ottawa, Montreal and Quebec in Canada plus several cities less important, such a megalopolis of the Great Lakes basin (including the valley of the Saint Lawrence River) brings together about 60 million inhabitants. The American part is known as the Rust Belt, while the Canadian part is called the Quebec-Windsor Corridor.
In the United States, the urban area located in California between the metropolitan areas of San Francisco "San Francisco (California)") and San Diego "San Diego (California)") - Tijuana has also become considered a megalopolis called SanSan, this includes the metropolitan areas of Los Angeles, Sacramento, and other smaller ones such as Stockton "Stockton (California)"), Fresno "Fresno (California)") and Bakersfield (more than 35 million inhabitants). Although if the Metropolitan Area of Tijuana (a conglomerate city with San Diego, California, USA) is included, it would have more than 37 million inhabitants.
In Mexico, the Regional Crown of the Center of the Country around the Valley of Mexico along with the metropolitan areas of Puebla - Tlaxcala, Cuernavaca - Cuautla "Cuautla (Morelos)"), Toluca, Pachuca, Tula de Allende, Tulancingo. Considering other smaller populations in the Valley of Mexico and its area of influence, it would reach a total population of more than 38.6 million inhabitants.
Also in Mexico, the Metropolitan Region of Bajío, a megalopolis formed by the geographical and cultural conditions and the proximity of the cities of the different states that make up the Mexican bajío "El Bajío (México)") and which is part of the North Central region of Mexico, would reach a total population of 11 million inhabitants.
In Brazil, the coastal area between Rio de Janeiro and São Paulo, together with other urban areas in the interior of the state of São Paulo, can be considered a megalopolis, with more than 40 million inhabitants.
In Argentina, a megalopolis has developed on the right bank of the Paraná and La Plata rivers between Greater Buenos Aires and Greater La Plata at its southern end, and Greater Santa Fe and Greater Paraná to the north, encompassing Greater Rosario and other smaller urban areas. Such a megalopolis exceeds 20 million inhabitants.
In Peru, the centralization of powers generated the embryo of a megalopolis on the central coast of the country, which includes metropolitan Lima (Lima and the port of Callao), which concentrates 9.6 million inhabitants as of 2013, along with other urban areas to the north, south and east of the metropolis, as well as some towns within a range of 200 km. In total, the agglomeration exceeds 10.5 million inhabitants.[5].
In Venezuela, in the so-called Coastal Mountain Range "Cordillera de la Costa (Venezuela)"), there are some of the most populated cities in Venezuela: the first, Caracas; the second, Maracaibo; the third, Valencia "Valencia (Venezuela)"); the fourth, Barquisimeto and the fifth, Maracay, Guarenas, Guatire, Greater Barcelona, Cumaná, Carúpano, Guiria, the cities of the Miranda State integrated into Greater Caracas, Los Teques, San Antonio de los Altos, as well as the towns of Choroní and Chuao, the cities of Carabobo, such as Puerto Cabello and Morón "Morón (Venezuela)"), the cities of the Yaracuy state, such as San Felipe and Chivacoa and the cities of Lara, such as Cabudare, Sanare and Tintorero, have developed a megalopolis that includes about 70% of the country's total population, about 22 million inhabitants.
In Colombia, in the so-called Golden Triangle, three of the country's main cities are at the vertex of Bogotá, Cali and Medellín (possible future Megalopolises), housing more than 60% of the population, generating 80% of the gross domestic product, 76% of manufacturing production, 72% of the construction industry, 75% of commerce, 30% of ports, 73% of the service sector, 77%. coffee, there are 60% of the economically active population and 69% of the installed capacity of the electrical network, exceeding 25 million inhabitants. Some important cities in the area are: Ibagué, Facatativá, Manizales, Pereira, Armenia, Girardot, Melgar "Melgar (Tolima)"), Zipaquirá. Barranquilla is also considered an important and future megalopolis, a strategic point in the country due to its location on the Magdalena River and the Caribbean Sea, and its proximity to Santa Marta "Santa Marta (Colombia)") and Cartagena and the construction expansion in these three cities.[6].
Asia
After the 1980s, the one located in the center of Japan is considered a gigantic megalopolis, extending for more than 1000 km from Tokyo, in the east, to Kitakyushu, in the west, bringing together approximately 80% of the Japanese population.
The Japanese megalopolis is made up of three assemblies: the hypercenter around the economic and administrative capital of the country, Tokyo (with 33 million inhabitants) and the Kanto region; then the secondary center connected by the Tokaido shinkansen with the hypercenter called Tōkaidō "Tōkaidō (region)") which is made up of Nagoya and Kansai (Osaka, Kōbe as well as Kyoto), constituting the Kinki triangle (22 million); Finally, the third group is made up in the west by coastal satellite cities that form a kind of industrial annex to the center.
Other megalopolises are developing in China with centers in Beijing, Shanghai and the Pearl River Delta, around Hong Kong, Shenzhen and Canton (Canton (China)).
India has three megalopolises around Calcutta, New Delhi and Bombay.
In the Philippines, the one developed around Manila.
Singapore in the small independent state of the same name and Malaysian cities such as Kuala Lumpur tend to constitute a megalopolis.
Jakarta, capital of Indonesia, constitutes a demographic megalopolis typical of the so-called Third World.
Europe
Defining what a megalopolis is in Europe is quite complex; We can speak of two levels of megalopolis: the large cities whose agglomerations exceed 10 million inhabitants: London, Paris, Moscow, Istanbul or the urban region (not yet fully conurbated) of the Randstad "Randstad (region)"), on the other hand a much broader definition of the so-called European Megalopolis with more than 70 million inhabitants that would include (very heterogeneously) the area of the West Midlands that goes from London (and its large cities satellites in England, for example Sheffield, Liverpool) to the Milan region in northern Italy via the Benelux, the Ruhr Basin in Germany, Strasbourg, Basel and the Zurich-Bern-Geneva basin "Geneva (city)"). This European metropolitan arc is also called the European Ridge or the "Blue Banana" by Roger Brunet, in the early 1990s because of the appearance it presents in satellite photographs. Currently, the agglomerations of Paris, Frankfurt am Main and even Turin tend to be included in such a European megalopolis. This "backbone" has been the driving center in political-economic terms of the European Union and even dominates the demographically less important peripheral regions of Europe.
Although in Spain there is no urban center or conurbation that can be properly classified as a megalopolis, there are urban trends that could result in such a type of urbanization: for example, the area that goes from the Spanish cities of Segovia, Guadalajara "Guadalajara (Spain)") and Toledo with Madrid as the central city can be considered a megalopolis or the sum of many micropolises for certain purposes: marketing, television, radio "Radio (media)"), newspapers "Newspaper (publication)"), trains, tourism, security, water, shopping malls, hospitals and universities, etc. and as a more restricted metropolitan area: El Escorial, Alcalá de Henares and Aranjuez. These demarcations are useful for regional planning in transportation and communications. Also in Spain-France there is the megalopolis, also called mega-region), Golden Banana, which connects the conurbations of Valencia, Barcelona, Marseille and Lyon. If the trends of conurbation and establishment of linear cities persist with the rhythm they currently have in Western Europe, it is very likely that the "Blue Banana" would soon spread from northern Italy along all the important cities of the Mediterranean coast of the French state and from there to, least, the cities of the Spanish Mediterranean such as Barcelona and Valencia (in which case the "Blue Banana" at the end of this century would almost be a semicircle - in the shape of an inverted C or ɔ - that would run from England to the coasts of the Spanish Mediterranean).
In Italy, two possible megalopolises are identified: that of Milan, whose urban region includes cities such as Brescia, Monza, Bergamo, Lodi "Lodi (Italy)"), Crema "Crema (Italy)") which constitute, due to the lack of a solution of continuity, a suburb of 7 million inhabitants and the Veneto center with the provinces of Vicenza, Padua, Treviso, Venice and Verona, which thanks to the development of the residential sector at the end of the century and the beginning century it has an almost continuous urban agglomeration of approximately four and a half million inhabitants.