Northeast megaregion (megalopolis) at night. Imagery was collected by the Suomi NPP satellite in April and October 2012, courtesy of the NASA Earth Observatory/NOAA NGDC.
The megaregions of the United States are gerally understood to be regions in the U.S. that contain two or more roughly adjact urban metropolitan areas that, through commonality of systems—of transport, economy, resources, and ecologies—experice blurred boundaries betwe the urban cters, such that perceiving and acting as if they are a continuous urban area is, for the purposes of policy coordination, of practical value.

The antecedt term, with which megaregions is synonymous, is megalopolis, which was coined in relation to the Boston through Washington, D.C., corridor in the Atlantic Northeast, by Jean Gottmann in the mid-twtieth ctury. America 2050,
Mega City One
A project of the Regional Plan Association, lists 11 megaregions compassing urban regions in the United States, Canada, and Mexico (e.g. the Great Lakes and Northeast Megaregions).
Megaregions were indepdtly explored in a 2005 report by Robert E. Lang and Dawn Dhavale of the Metropolitan Institute at Virginia Tech.
In the perspective of a Texas group research group whose focus is education, and technology transfer initiatives to improve the mobility of people and goods in urban and rural communities of megaregions, there is no single, preponderant, widely agreed upon statutory/regulatory definition of a megaregion.
New York: Die Megacity » Faszination Fernweh
Initiative to describe a group of two or more roughly adjact metropolitan areas that, through commonality of systems—e.g., of transport, economy, resources, and ecologies—experice a blurring of the boundaries betwe the population cters, such that while some degree of separation may remain, their perception as a continuous urban area, e.g., to coordinate policy at this expanded scale, is of value.
Its direct antecedt, in the same organisation and scholarship, is in the term megalopolis, which was repurposed from earlier differt meanings by Jean Gottmann of the University of Paris and the Institute for Advanced Study at Princeton in the late 1950s and early 1960s. Gottmann directed A Study of Megalopolis for The Twtieth Ctury Fund, applying that term to an analysis of the urbanized northeastern seaboard of the U.S. spanning from Boston in the north to Washington, D.C. in the south and including New York City, Philadelphia, and Baltimore, which was named the Northeast megalopolis,
) A reputable, broader American description from the same organisation defines a megaregion as a large network of metropolitan regions that share several or all of the following:
Latin American Cities. Mega City A Metropolitan Area With More Than 10 Million People. In 1994 There Were 15 Megacities. By 2030, It Is Expected.
Megaregions are spok of as becoming the new competitive units in the global economy, characterized by the increasing movemt of goods, people and capital among their metropolitan regions.
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The New Megas, asserts Richard Florida, are the real economic organizing units of the world, producing the bulk of its wealth, attracting a large share of its talt and gerating the lion's share of innovation.
Despite these scholarly perspectives, statutory and regulatory documts have not arrived at a single definition, which has led to variations on what should be prioritized within megaregions across jurisdictions.
Land Use And Land Use Change
The megaregion concept provides cities and metropolitan regions a context within which to cooperate across jurisdictional borders, including the coordination of policies, to address specific challges expericed at the megaregion scale, such as planning for high-speed rail, protecting large watersheds, and coordinating regional economic developmt strategies. However, megaregions are not formally recognized in the hierarchy of governance structure like a city or metropolitan planning organization (MPO). In cont, megaregions that cross international borders (such as the Southern California, Gulf Coast, and Arizona Sun Corridor megaregions), while having a shared history and culture, are oft limited in power. Overall, planning in cross-jurisdictional megaregions can be susceptible to varying levels of regulations. This makes creating plans for megaregions surprisingly complex.
This methodology was much more successful at idtifying fast-growing regions with existing metropolitan cters than more sparsely populated, slower growing regions. Nor does it include a distinct marker for connectedness betwe cities.

Buffalo, Chicago, Cincinnati, Cleveland, Columbus, Detroit, Erie, Fox Cities**, Grand Rapids, Hamilton, Indianapolis, Kansas City**, Louisville, Madison, Milwaukee, Minneapolis–Saint Paul**, Montreal**, Ottawa**, Pittsburgh, Quebec City**, Rochester**, Sarnia, Sault Ste. Marie**, Niagara Falls, St. Louis, Sudbury, Syracuse, Toledo, Toronto, Twin Ports**, Wheeling, Windsor
What Is A Megacity?
Atlantic City, Baltimore, Boston, Brookhav, Bridgeport, Danbury, Hampton Roads (Virginia Beach, Norfolk), Harrisburg, Hempstead, Islip, Jersey City, Lehigh Valley (Alltown-Bethlehem-Easton), Newark, New Hav, New York, Norwalk, Oyster Bay, Paterson, Philadelphia, Portland (ME), Providce, Richmond, Knowledge Corridor (Springfield and Hartford), Stamford, Trton, Washington, Waterbury, Wilmington, Worcester, Yonkers
Thirte of the top 100 American primary csus statistical areas are not included in any of the 11 emerging mega-regions. However, the Lexington-based CSA in Ktucky is idtified by the RPA as being part of an area of influce of the Great Lakes megalopolis, while the Albany and Syracuse-based CSAs in Upstate New York are shown as being within the influce of the Northeastern mega-region. Similarly, the Augusta, GA and Columbia, SC-based CMA are considered influced by the Piedmont-Atlantic megalopolis, Jackson, MS CMA by the Gulf Coast megaregion, Little Rock, AR CMA by the Texas Triangle, and the Des Moines and Omaha-based CMAs by the Great Lakes megalopolis. The El Paso, TX CMA is roughly equidistant from two megaregions, being near the southeastern edge of the Arizona Sun Corridor area of influce and the southern tip of the Front Range area of influce. This leaves Honolulu, HI, Wichita, KS, Springfield, MO and Charleston, SC as the only top 100 American CMAs that have no mega-region affiliation of any kind as defined by the RPA.
Though idtification of the megaregions has gone through several iterations, the above idtified are based on a set of criteria developed by Regional Plan Association, through its America 2050 initiative - a joint vture with the Lincoln Institute of Land Policy. Two historic publications helped lay the foundation for this new set of criteria, the book Megalopolis by Jean Gottmann (1961)

Adapting The Army To Win Decisively In Megacities
The relationships underpinning megaregions have become more pronounced over the second half of the 20th ctury as a result of dectralized land developmt, longer daily commutes, increased business travel, and a more footloose, flexible, knowledge workforce. The idtification of new geographic scales—historically based on increased population movemt from the city cter to lower dsity areas as a megaregion prests immse opportunities from a regional planning perspective, to improve the vironmtal, infrastructure and other issues shared among the regions within it. The most rect and only previous attempt to plan at this scale happed more than 70 years ago, with the Tnessee Valley Authority. Political issues stymied further efforts at river basin planning and developmt.
In 1961's Megalopolis, Gottman describes the Northeastern seaboard of the United States - or Megapologis - as ... difficult to single out ... from surrounding areas, for its limits cut across established historical divisions, such as New gland and the Middle Atlantic states, and across political tities, since it includes some states tirely and others only partially. On the complex nature of this regional scale, he writes:
Some of the major characteristics of Megalopolis, which set it apart as a special region within the United States, are the high degree of conctration of people, things and functions crowded here, and also their variety. This kind of crowding and its significance cannot be described by simple measuremts. Its various aspects will be shown on a number of maps, and if these could all be superimposed on one base map there would be demarcated an area in which so many kinds of crowding coincide in geral (though not always in all the details of their geographical distribution) that the region is quite differt from all neighboring regions and in fact from any other part of North America. The esstial reason for its differce is the greater conctration here of a greater variety of kinds of crowding. Crowding of population, which may first be expressed in terms of dsities per square mile, will, of course, be a major characteristic to survey. As this study aims at understanding the meaning of population dsity, we shall have to know the foundation that supports such crowding over such a very vast area. What do these people do? What is their average income and their standard of living? What is the distribution pattern of wealth and of certain more highly paid occupations? For example, the outstanding conctration of population in the City of New York and its immediate suburbs (a mass of more than t million people by any count) cannot be separated from the ormous conctration in the same city of banking, insurance, wholesale, tertainmt, and transportation activities. These various kinds of conctration have attracted a whole series of other activities, such as managemt of large corporations, retail business, travel agcies, advertising, legal and technical counseling offices, colleges, research organizations, and so on. Coexistce of all these facilities on an unequaled scale within the relatively small territory of New York City, and especially of its business district...has made the place ev more attractive to additional banking, insurance, and mass media organizations.[21]
Atmospheric Particulate Pollution In South American Megacities
In the US, megaregions have be garnering more atttion at the federal level. In 2016, the United States Departmt of Transportation (USDOT) awarded The University of Texas at Austin a five-year grant

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