Megalopolis
Humanity's footprint on Earth is growing, transforming vast landscapes into sprawling urban tapestries. The concept of a Megalopolis isn't just about a really big city; it describes an interconnected network of metropolitan areas so vast they blur into a continuous urban system. These colossal urban formations represent a new frontier in how we understand, plan, and live within our ever-expanding world. A megalopolis is a complex system of interconnected cities, not just one giant metropolis, defined by shared infrastructure and economic ties. The concept, popularized by Jean Gottmann, revolutionized urban planning by shifting focus to regional, rather than purely local, development. As these megaregions continue to grow globally, new methods are emerging to consistently measure and manage their immense scale and impact.
AI Summary
Humanity's footprint on Earth is growing, transforming vast landscapes into sprawling urban tapestries. The concept of a Megalopolis isn't just about a really big city; it describes an interconnected network of metropolitan areas so vast they blur into a continuous urban system. These colossal urban formations represent a new frontier in how we understand, plan, and live within our ever-expanding world.
- A megalopolis is a complex system of interconnected cities, not just one giant metropolis, defined by shared infrastructure and economic ties.
- The concept, popularized by Jean Gottmann, revolutionized urban planning by shifting focus to regional, rather than purely local, development.
- As these megaregions continue to grow globally, new methods are emerging to consistently measure and manage their immense scale and impact.
The Rise of the Megalopolis
Imagine not just one city, but a whole constellation of them, growing so close they seem to merge into a single, vast urban entity. That's the essence of a megalopolis—a group of metropolitan areas so deeply interconnected by transport, economy, and shared resources that they function as one continuous urban landscape.
While each city within a megalopolis retains its distinct identity, their shared systems mean that coordinating policies across the entire region becomes incredibly valuable. It's a testament to how human settlements can evolve beyond traditional city limits, creating something truly monumental.
From Ancient Greece to Modern Maps
The term itself dates back to ancient Greek, literally meaning 'big city'—megalo-polis. It was first documented in a geographical sense in 1832, describing a 'very large, heavily populated urban complex,' a straightforward definition for its time.
But it was a brilliant geographer named Jean Gottmann who truly gave the concept its modern depth in the late 1950s. He meticulously studied the urbanized northeastern seaboard of the U.S.—the corridor stretching from Boston all the way to Washington, D.C.—and coined it the Northeast Megalopolis.
Gottmann described this immense region as a 'world of ideas,' recognizing that these weren't just cities next to each other, but a dynamic, integrated system. His work introduced a new, much larger scale of thinking about urban patterns and growth, shaping how we see these immense urban webs today.
Defining the Urban Colossus
Today, you'll hear terms like 'megalopolis,' 'megaregion,' or even 'city cluster' used interchangeably to describe these massive urban formations. Different scholars and nations have adapted the concept to their own contexts, but the core idea remains: profound interconnectedness.
Following Gottmann's insights, a modern megalopolis typically involves two or more adjacent metropolitan areas. What truly binds them is a commonality of systems—be it transportation networks, economic ties, or shared ecological concerns—blurring their individual boundaries into a continuous, perceived whole.
This blurring of lines isn't just theoretical; it has real-world implications. It makes coordinating policies for infrastructure, environmental protection, or economic development across the entire region vitally important. Gottmann suggested a population threshold of 25 million, while others proposed around 10 million for smaller versions of these clusters.
These regions aren't abstract concepts—they're vibrant, living entities. In the United States and Canada, for instance, programs like America 2050 have identified 11 distinct megaregions, acknowledging their unique characteristics and planning needs for the future.
Modern transportation corridors—think high-speed rail lines and vast highway networks—are the literal arteries that keep these giant urban systems flowing. Commuting throughout a megalopolis has even earned its own informal term: 'megaloping,' coined by researchers Davide Gadren and Stefan Berteau.
Global Perspectives and Measurement Challenges
The idea of a 'city cluster' or '城市群' (chéngshì qún) is especially central to urban planning in China. The National Development and Reform Commission actively plans for these clusters, recognizing their immense role in the nation's economic and population growth.
However, comparing urban data across countries and over time is notoriously difficult. Arbitrary definitions, varying from one census to the next, often mean we're not truly comparing apples to apples when looking at urban sprawl globally.
To address this, the Urban Metric System, or UMS, has been developed. It aims to provide a universal framework for defining urban areas consistently. This innovative approach treats inhabitants and jobs as exerting attractive and repulsive forces, much like particles in a field.
Using vector field calculations, UMS determines urban area limits and central points regardless of location or time period. The net force between these 'urban particles' is defined by a formula, where 'd' is distance and 'β' is a key parameter that helps distinguish different types of urban areas, including megalopolises.
\frac{1}{1 + d} - \frac{1}{\beta + d/2}By applying this system, UMS can categorize various urban structures, from individual cities to entire megalopolises, using a single, uniform method. While still in its early stages of adoption—having been applied to cases like Canada since 2018—it offers a glimpse into a future of standardized urban measurement.
Megalopolises in Imagination
The sheer scale of a megalopolis has long captured the human imagination, inspiring vivid fictional worlds. In the iconic 'Judge Dredd' comic series, for example, we find Mega-City One—a colossal city-state covering much of what was once the Eastern United States.
Mega-City One began as a futuristic vision of New York City's urban sprawl, later retconned into the very core of this immense urban landscape. It's a place where city life is pushed to its absolute limits, making it one of the most memorable fictional cities ever conceived.
William Gibson's groundbreaking 'Sprawl Trilogy' takes this idea even further with the 'Boston-Atlanta Metropolitan Axis'—or BAMA. This fictional extension of the real Northeast Megalopolis envisions a future where almost the entire U.S. East Coast has fused into one gargantuan urban mass.
In Gibson's vision, 'the Sprawl' is so vast it's enclosed in geodesic domes, creating its own artificial, perpetually gray sky. It becomes a separate world, a fascinating, if sometimes unsettling, exploration of humanity's future in an age of unchecked urban expansion.
Article
Megalopolis
A satellite image of the Pearl River Delta area in China
A megalopolis (), also called a supercity or megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough that coordinating policy is valuable, although the constituent metropolises keep their individual identities. The megalopolis concept has become highly influential as it introduced a new, larger scale thinking about urban patterns and growth.
Etymology and earlier definitions
Megalopolis
The term comes from the Greek word megalo-polis (big city), and was originally given as an aspirational name to the settlement of Megalopolis in Arcadia in southern Greece, founded during the 4th century BC. In modern history, the term has geographic definitions dating from 1832, when its meaning was "a very large, heavily populated urban complex".
In the late 1950s and early 1960s, Jean Gottmann, a professor of political science at the University of Paris and member of the Institute for Advanced Study at Princeton, directed "A Study of Megalopolis" for The Twentieth Century Fund, wherein he described a megalopolis as a "world of ideas". Gottmann, in his extensive studies, applied the term megalopolis to an analysis of the urbanized northeastern seaboard of the U.S., in particular from Boston, Massachusetts to Washington, D.C. (the Northeast megalopolis).
Modern definitions
Megalopolis
Northeast megalopolis (United States) (top) and Taiheiyō Belt (Japan) (bottom)
A megalopolis may also be called a megaregion. "Megalopolis" and other similar terms have been used by different scholars and countries to describe similar spatial forms.
The São Paulo macrometropolis in Brazil
A megalopolis, following the work of Gottmann, refers to two or more roughly adjacent metropolitan areas that, through a commonality of systems—e.g., of transport, economy, resources, and ecologies—experience a blurring of the boundaries between the population centers, such that while some degree of separation may remain, their perception as a continuous urban area is of value, e.g., "to coordinate policy at this expanded scale". Simply put, a megalopolis (or a megaregion) is a clustered network of big cities. Gottmann defined its population as 25 million, while Doxiadis defined a small megalopolis a similar cluster with a population of about 10 million. America 2050, a program of the Regional Plan Association (RPA), lists 11 megaregions in the United States and Canada.
Megaregions of the United States 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, a term coined by Davide Gadren and Stefan Berteau.
In Brazil, the term megarregião has a legal meaning, different from the English word megaregion: mesoregions of Brazil (mesorregião) and microregions of Brazil (microrregião).
In China, the official term corresponding to the meaning of "megalopolis" is '城市群' (chéngshì qún), which, in Chinese, was originally coined by Yao Shimou and literally means "city cluster". A "city cluster" is defined as "[a]n area in which cities are relatively densely distributed in a certain region". In an older standard, the term was mistranslated as "agglomeration". In 2019, National Development and Reform Commission (NDRC) published guidelines and made a distinction from a similar concept "metropolitan area" (都市圈), which is of a smaller scale than a city cluster. In the latest standard terminologies of both economics and urban planning, 城市群 is translated as "city cluster", replacing "agglomeration". Megalopolises in China have become the subject of national government planning.
Since, presently, urban data are based on arbitrary definitions that vary from country to country and from year or census to the next, making them difficult to compare, an Urban Metric System (UMS) has been conceived that could correct the problem, since it allows computing the urban area limits and central points, and it can be applied in the same way to all past, present and future population and job distributions.
UMS is based on vector field calculations obtained by assuming that, in a given space, all inhabitants and jobs exert the same attractive force A and repulsive force R. The net force (A - R) exerted by each inhabitant or job is given by [1/(1 + d)] - [1/( β + d/2)], where d = distance and β is the only parameter. UMS distinguishes the following types of urban areas (including "Megalopolis"), each type corresponding to a given value of β:
<table><thead><tr><th></th><th>Urban area</th><th>Distance at which the attractive force = the repulsive force</th><th>Value of β</th></tr><tr><th>1</th><th>Central city</th><th>10 km</th><th>6</th></tr><tr><th>2</th><th>Agglomeration</th><th>20 km</th><th>11</th></tr><tr><th>3</th><th>Metropolis</th><th>40 km</th><th>21</th></tr><tr><th>4</th><th>Patropolis</th><th>80 km</th><th>41</th></tr><tr><th>5</th><th>Megalopolis</th><th>160 km</th><th>81</th></tr><tr><th>6</th><th>Urban system</th><th>320 km</th><th>161</th></tr><tr><th>7</th><th>Urban macrosystem</th><th>640 km</th><th>321</th></tr><tr><th>8</th><th>Continental system</th><th>1,280 km</th><th>641</th></tr><tr><th>9</th><th>Intercontinental system</th><th>2,560 km</th><th>1,281</th></tr><tr><th>10</th><th>World system</th><th>5,120 km</th><th>2,561</th></tr></thead><tbody></tbody></table>
UMS has been applied to some Canadian cases since 2018, but the data presented in this article are still based on the various existing national definitions, which are disparate.
In popular culture
Judge Dredd
In the Judge Dredd (1977) comic book series and its spinoff series, Mega-City One is a huge fictional megalopolis-size city-state covering much of what is now the Eastern United States and some of Canada. The exact geography of the city depends on which writer and artist has done which story. However, from its first appearance it has been associated with New York City's urban sprawl; originally, it was presented as a future New York, which was retconned as the centre of a "Mega-City One" in the very next story. The Architects' Journal placed it at No. 1 in their list of "comic book cities".
Sprawl trilogy
In William Gibson's Sprawl trilogy, "the Sprawl" is a colloquial name for the "Boston-Atlanta Metropolitan Axis" (BAMA), an urban sprawl environment on a massive scale, and a fictional extension of the real Northeast megalopolis. The Sprawl is a visualization of a future where virtually the entire East Coast of the United States, from Boston to Atlanta, has melded into a single mass of urban sprawl. It has been enclosed in several geodesic domes and merged into one megacity. The city has become a separate world with its own climate, no real night/day cycle, and an artificial sky that is always grey.
Megalopolis (film)
In Francis Ford Coppola's 2024 film Megalopolis, architect Cesar Catalina (Adam Driver) endeavors to build a city of the future within New Rome out of a material known as "Megalon". This city, built on top of the crater caused by a fallen USSR satellite, is the titular Megalopolis.
Dune
The seat of political power on the planet Arrakis under the rule of the tyrannical Harkonnen family was the megalopolis "Carthag". When house Atreides was given control of the planet, they ruled from the capital city, Arrakeen.