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A city is a relatively large and permanent settlement. Although there is no agreement on how a city is distinguished from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.

For example, in the American state of Massachusetts an article of incorporation approved by the local state legislature distinguishes a city government from a town. In the United Kingdom and parts of the Commonwealth of Nations, a city is usually a settlement with a royal charter. Historically, in Europe, a city was understood to be an urban settlement with a cathedral. This distinction also applies in England (but not to the entire United Kingdom), where the presence of a cathedral church distinguishes a 'city' from a 'town' (which has a parish church).

Cities generally have complex systems for sanitation, utilities, land usage, housing, and transportation. The concentration of development greatly facilitates interaction between people and businesses, benefiting both parties in the process. A big city or metropolis usually has associated suburbs and exurbs. Such cities are usually associated with metropolitan areas and urban areas, creating numerous business commuters traveling to urban centers for employment. Once a city expands far enough to reach another city, this region can be deemed a conurbation or megalopolis.

Contents
1 Origins
1.1 Theories
1.1.1 Agricultural primacy
1.1.2 Urban primacy
1.2 Causes of establishment
2 Geography
3 History
3.1 Ancient times
3.2 Middle Ages
3.3 Early modern
3.4 Industrial age
4 External effects
5 Distinction between cities and towns
5.1 Australia
5.2 Argentina
5.3 Azerbaijan
5.4 Belarus
5.5 Bangladesh
5.6 Belgium
5.7 Brazil
5.8 Bulgaria
5.9 Canada
5.10 China (People's Republic of China)
5.11 Chile
5.12 Denmark
5.13 Egypt
5.14 France
5.15 Finland
5.16 Germany
5.17 Greece
5.18 Iceland
5.19 India
5.20 Indonesia
5.21 Iran
5.22 Iraq
5.23 Ireland
5.24 Israel
5.25 Italy
5.26 Kazakhstan
5.27 Japan
5.28 Malaysia
5.29 Mexico
5.30 Netherlands
5.31 Nigeria
5.32 New Zealand
5.33 Norway
5.34 Pakistan
5.35 Philippines
5.36 Poland
5.37 Portugal
5.38 Romania
5.39 Russia
5.40 South Africa
5.41 South Korea
5.42 South Sudan
5.43 Sweden
5.44 Taiwan (Republic of China)
5.45 Turkey
5.46 Ukraine
5.47 United Kingdom
5.48 United States
5.49 Venezuela
6 Global cities
7 Inner city
8 21st century
9 See also
10 Notes
11 References
12 Further reading
13 External links

Origins There is insufficient evidence to assert what conditions gave rise to the first cities. Some theorists, however, have speculated on what they consider suitable pre-conditions, and basic mechanisms that might have been important driving forces.

Theories Agricultural primacyThe conventional view holds that cities first formed after the Neolithic revolution. The Neolithic revolution brought agriculture, which made denser human populations possible, thereby supporting city development. The advent of farming encouraged hunter-gatherers to abandon nomadic lifestyles and to settle near others who lived by agricultural production. The increased population-density encouraged by farming and the increased output of food per unit of land created conditions that seem more suitable for city-like activities. In his book, Cities and Economic Development, Paul Bairoch takes up this position in his argument that agricultural activity appears necessary before true cities can form.

According to Vere Gordon Childe, for a settlement to qualify as a city, it must have enough surplus of raw materials to support trade and a relatively large population.[4] Bairoch points out that, due to sparse population densities that would have persisted in pre-Neolithic, hunter-gatherer societies, the amount of land that would be required to produce enough food for subsistence and trade for a large population would make it impossible to control the flow of trade. To illustrate this point, Bairoch offers an example: "Western Europe during the pre-Neolithic, [where] the density must have been less than 0.1 person per square kilometer". Using this population density as a base for calculation, and allotting 10% of food towards surplus for trade and assuming that city dwellers do no farming, he calculates that "in order to maintain a city with a population of 1,000, and without taking the cost of transportation into account, an area of 100,000 square kilometers would have been required. When the cost of transportation is taken into account, the figure rises to 200,000 square kilometers...". Bairoch noted that this is roughly the size of Great Britain.

Urban primacyTheorist Jane Jacobs claims that city-formation preceded the birth of agriculture though offers no support for this theory. Jacobs does not lend her theory to any reasonably strict definition of a city, but her account suggestively or vaguely contrasts what could be thought of as primitive city-like activity to the activity occurring in neighboring hunter-gatherer settlements. To argue this view, she suggests a fictitious scenario where a valued natural resource leads to primitive economic activity - she takes obsidian as an example. The stock of obsidian is controlled and traded with neighboring hunting groups. Hunters who do not control the stock travel great distances to barter what they have, valuing obsidian because it "makes the sharpest tools to be had".[6] This activity brings more people to the center as jobs are created and goods are being traded. Among the goods traded are seeds of all different sorts, stored in unprecedented combinations. In various ways, some accidental, the seeds are sown, and the variation in yields are observed more readily than they would be in the wild. The seeds that yield the most grain are noticed and trading them begins to occur within the city. Owing to this local dealing, the city dwellers find that their grain yields are the best, and for the first time make deliberate and conscious selection. The choices made now become purposeful, and they are made among various strains of already cultivated crosses, and their crosses, mutants and hybrids.

Causes of establishmentTheorists have suggested many possible reasons for why people would have originally decided to come together to form dense populations. In his book City Economics, Brendan O'Flaherty asserts "Cities could persist—as they have for thousands of years—only if their advantages offset the disadvantages" (O'Flaherty 2005, p. 12). O'Flaherty illustrates two similar attracting advantages known as increasing returns to scale and economies of scale, which are concepts normally associated with firms. Their applications are seen in more basic economic systems as well. Increasing returns to scale occurs when "doubling all inputs more than doubles the output [and] an activity has economies of scale if doubling output less than doubles cost" (O'Flaherty 2005, pp. 572–573). To offer an example of these concepts, O'Flaherty makes use of "one of the oldest reasons why cities were built: military protection" (O'Flaherty 2005, p. 13). In this example, the inputs are anything that would be used for protection (e.g.: a wall) and the output is the area protected and everything of value contained in it. O'Flaherty then asks that we suppose that the area to be protected is square and each hectare inside it has the same value of protection. The advantage is expressed as: (O'Flaherty 2005, p. 13)

(1) , where O is the output (area protected) and s stands for the length of a side. This equation shows that output is proportional to the square of the length of a side.
The inputs depend on the length of the perimeter:

(2) , where I stands for the quantity of inputs. This equation shows that the perimeter is proportional to the length of a side.
So there are increasing returns to scale:

(3) . This equation (solving for in (1) and substituting in (2)) shows that with twice the inputs, you produce quadruple the output.
Also, economies of scale:

(4) . This equation (solving for in equation (3)) shows that the same output requires less input.
"Cities, then, economize on protection, and so protection against marauding barbarian armies is one reason why people have come together to live in cities..." (O'Flaherty 2005, p. 13).

Similarly, "Are Cities Dying?", a paper by Harvard economist Edward L. Glaeser, delves into similar reasons for city formation: reduced transport costs for goods, people, and ideas. Discussing the benefits of proximity, Glaeser claims that if you double a city size, workers have a ten-percent increase in earnings. Glaeser furthers his argument by stating that bigger cities do not pay more for equal productivity than in a smaller city, so it is reasonable to assume that workers become more productive if they move to a city twice the size as they initially worked in. However, the workers do not benefit much from the ten-percent wage increase, because it is recycled back into the higher cost of living in a bigger city. They do gain other benefits from living in cities, though.


A map dating 1669 showing the location of Multan, Pakistan.[edit] Geography
Map of Haarlem, the Netherlands, of around 1550. The city is completely surrounded by a city wall and defensive canal. The square shape was inspired by Jerusalem.City planning has seen many different schemes for how a city should look. The most commonly seen pattern is the grid, used for thousands of years in China, independently invented by Alexander the Great's city-planner Dinocrates of Rhodes and favoured by the Romans, while almost a rule in parts of pre-Columbian America. Derry begun in 1613, was the first planned city in Ireland, with the walls being completed five years later. The central diamond within a walled city with four gates was thought to be a good design for defence. The grid pattern was widely copied in the colonies of British North America.

The Ancient Greeks often gave their colonies around the Mediterranean a grid plan. One of the best examples is the city of Priene. This city had different specialized districts, much as is seen in modern city planning today. Fifteen centuries earlier, the Indus Valley Civilization was using grids in such cities as Mohenjo-Daro. In medieval times there was evidence of a preference for linear planning. Good examples are the cities established by various rulers in the south of France and city expansions in old Dutch and Flemish cities.

Grid plans were popular among planners in the 19th century, particularly after the redesign of Paris. They cut through the meandering, organic streets that followed old paths. The United States imposed grid plans in new territories and towns, as the American West was rapidly established, in places such as Salt Lake City and San Francisco.

Other forms may include a radial structure, in which main roads converge on a central point. This was often a historic form, the effect of successive growth over long time with concentric traces of town walls and citadels. In more recent history, such forms were supplemented by ring-roads that take traffic around the outskirts of a town. Many Dutch cities are structured this way: a central square surrounded by concentric canals. Every city expansion would imply a new circle (canals together with town walls). In cities such as Amsterdam, Haarlem, and also Moscow, this pattern is still clearly visible.

History Further information: Historical cities and List of largest cities throughout history

The Round city of Baghdad, the capital of Iraq
Extent and major sites of the Indus Valley Civilization of ancient IndiaTowns and cities have a long history, although opinions vary on whether any particular ancient settlement can be considered to be a city. A city formed as central places of trade for the benefit of the members living in close proximity to others facilitates interaction of all kinds. These interactions generate both positive and negative externalities between others' actions. Benefits include reduced transport costs, exchange of ideas, sharing of natural resources, large local markets, and later in their development, amenities such as running water and sewage disposal. Possible costs would include higher rate of crime, higher mortality rates, higher cost of living, worse pollution, traffic and high commuting times. Cities will grow when the benefits of proximity between people and firms are higher than the cost.

The first true towns are sometimes considered to be large settlements where the inhabitants were no longer simply farmers of the surrounding area, but began to take on specialized occupations, and where trade, food storage and power was centralized. In 1950 Gordon Childe attempted to define a historic city with 10 general metrics.[7] These are:

1.Size and density of the population should be above normal.
2.Differentiation of the population. Not all residents grow their own food, leading to specialists.
3.Payment of taxes to a deity or king.
4.Monumental public buildings.
5.Those not producing their own food are supported by the king.
6.Systems of recording and practical science.
7.A system of writing.
8.Development of symbolic art.
9.Trade and import of raw materials.
10.Specialist craftsmen from outside the kin-group.
This categorisation is descriptive, and it is used as a general touchstone when considering ancient cities, although not all have each of its characteristics.

One characteristic that can be used to distinguish a small city from a large town is organized government. A town accomplishes common goals through informal agreements between neighbors or the leadership of a chief. A city has professional administrators, regulations, and some form of taxation (food and other necessities or means to trade for them) to feed the government workers. The governments may be based on heredity, religion, military power, work projects (such as canal building), food distribution, land ownership, agriculture, commerce, manufacturing, finance, or a combination of those. Societies that live in cities are often called civilizations.


Mohenjo-daro, a World Heritage site that was part of the Indus Valley Civilization.[edit] Ancient timesFurther information: Cities of the Ancient Near East, Polis, and City-state

The ancient Ur of Sumer, in present day Tell el-Mukayyar in Iraq is one of the world's earliest ?ities.
View of the Agora of Athens. The temple of Hephaestus is to the left and the Stoa of Attalos to the right.
Scale model of ancient Rome, 3rd century AD
A model of native American pyramids in the Zócalo in the center of Mexico City
Daily life of people from the Song period at the capital, Bianjing, today's Kaifeng.
Constantinople was the largest and wealthiest city in Europe from the 9th through the 12th century.Early cities developed in a number of regions of the ancient world. Mesopotamia can claim the earliest cities, particularly Eridu, Uruk, and Ur.[citation needed] After Mesopotamia, this culture arose in Syria and Anatolia, as shown by the city of Çatalhöyük (7500-5700BC). It is the largest Neolithic site found to date.[citation needed] Although it has sometimes been claimed[citation needed] that ancient Egypt lacked urbanism, several types of urban settlements were found in ancient times.

The Indus Valley Civilization and ancient China are two other areas with major indigenous urban traditions. Among the early Old World cities, Mohenjo-daro of the Indus Valley Civilization in present-day Pakistan, existing from about 2600 BC, was one of the largest, with a population of 50,000 or more.[8]

In ancient Greece, beginning in the early 1st millennium BC, there emerged independent city-states that evolved for the first time the notion of citizenship, becoming in the process the archetype of the free city, the polis.[9] The Agora, meaning "gathering place" or "assembly", was the center of athletic, artistic, spiritual and political life of the polis. These Greek city-states reached great levels of prosperity that resulted in an unprecedented cultural boom, that of classical Greece, expressed in architecture, drama, science, mathematics and philosophy, and nurtured in Athens under a democratic government. The Greek Hippodamus of Miletus (c. 407 BC) has been dubbed the "Father of City Planning" for his design of Miletus; the Hippodamian, or grid plan, was the basis for subsequent Greek and Roman cities. In the 4th century BC, Alexander the Great commissioned Dinocrates of Rhodes to lay out his new city of Alexandria, the grandest example of idealized urban planning of the ancient Mediterranean world, where the city's regularity was facilitated by its level site near a mouth of the Nile.

This roster of early urban traditions is notable for its diversity. Excavations at early urban sites show that some cities were sparsely populated political capitals, others were trade centers, and still other cities had a primarily religious focus. Some cities had large dense populations, whereas others carried out urban activities in the realms of politics or religion without having large associated populations. Theories that attempt to explain ancient urbanism by a single factor, such as economic benefit, fail to capture the range of variation documented by archaeologists.

The growth of the population of ancient civilizations, the formation of ancient empires concentrating political power, and the growth in commerce and manufacturing led to ever greater capital cities and centres of commerce and industry, with Alexandria, Antioch and Seleucia of the Hellenistic civilization, Pataliputra (now Patna) in India, Chang'an (now Xi'an) in China, Carthage, ancient Rome, its eastern successor Constantinople (later Istanbul).

Keith Hopkins estimates that ancient Rome had a population of about a million people by the end of the 1st century BC,[13] after growing continually during the 3rd, 2nd, and 1st centuries BC, making it the largest city in the world at the time. Alexandria's population was also close to Rome's population at around the same time, the historian Rostovtzeff estimates a total population close to a million based on a census dated from 32 AD that counted 180,000 adult male citizens in Alexandria.

Cities of Late Antiquity underwent transformations as the urban power base shrank and was transferred to the local bishop (see Late Roman Empire). Cities essentially disappeared, earliest in Roman Britain and Germania and latest in the Eastern Roman Empire and Visigothic Spain.[citation needed]

In the ancient Americas, early urban traditions developed in the Andes and Mesoamerica. In the Andes, the first urban centers developed in the Norte Chico civilization (also Caral or Caral-Supe civilization), Chavin and Moche cultures, followed by major cities in the Huari, Chimu and Inca cultures. The Norte Chico civilization included as many as 30 major population centers in what is now the Norte Chico region of north-central coastal Peru. It is the oldest known civilization in the Americas, flourishing between the 30th century BC and the 18th century BC. Mesoamerica saw the rise of early urbanism in several cultural regions, including the Preclassic Maya, the Zapotec of Oaxaca, and Teotihuacan in central Mexico. Later cultures such as the Aztec drew on these earlier urban traditions.

In the first millennium AD, an urban tradition developed in the Khmer region of Cambodia, where Angkor grew into one of the largest cities (in area) of the world. The closest rival to Angkor, the Mayan city of Tikal in Guatemala, was between 100 and 150 square kilometres (39 and 58 sq mi) in total size. Although its population remains a topic of research and debate, newly identified agricultural systems in the Angkor area may have supported up to one million people.

Agriculture was practiced in sub-Saharan Africa since the third millennium BC. Because of this, cities were able to develop as centers of non-agricultural activity. Exactly when this first happened is still a topic of archeological and historical investigation. Western scholarship has tended to focus on cities in Europe and Mesopotamia, but emerging archeological evidence indicates that urbanization occurred south of the Sahara well before the influence of Arab urban culture. The oldest sites documented thus far are from around 500 AD including Awdaghust, Kumbi-Saleh the ancient capital of Ghana, and Maranda a center located on a trade rout between Egypt and Gao.

Middle Ages
This woodcut shows Nuremberg as a prototype of a flourishing and independent city in the 15th centuryWhile David Kessler and Peter Temin consider ancient Rome to be the largest city before 19th century London and the first to have exceeded a population of over 1 million, George Modelski considers medieval Baghdad, with an estimated population of 1.2 million at its peak, to be the largest city before 19th century London and the first with a population of over one million. Others estimate that Baghdad's population may have been as large as 2 million in the 9th century.

From the 9th through the end of the 12th century, the city of Constantinople, capital of the Byzantine Empire, was the largest and wealthiest city in Europe, with a population approaching 1 million.

During the European Middle Ages, a town was as much a political entity as a collection of houses. City residence brought freedom from customary rural obligations to lord and community: "Stadtluft macht frei" ("City air makes you free") was a saying in Germany. In Continental Europe cities with a legislature of their own were not unheard of, the laws for towns as a rule other than for the countryside, the lord of a town often being another than for surrounding land. In the Holy Roman Empire some cities had no other lord than the emperor. In Italy medieval communes had quite a statelike power. In exceptional cases like Venice, Genoa or Lübeck, cities themselves became powerful states, sometimes taking surrounding areas under their control or establishing extensive maritime empires. Similar phenomena existed elsewhere, as in the case of Sakai, which enjoyed a considerable autonomy in late medieval Japan.

Early modern
Danzig in the 17th centuryWhile the city-states, or poleis, of the Mediterranean and Baltic Sea languished from the 16th century, Europe's larger capitals benefited from the growth of commerce following the emergence of an Atlantic trade. By the early 19th century, London had become the largest city in the world with a population of over a million, while Paris rivaled the well-developed regionally traditional capital cities of Baghdad, Beijing, Istanbul and Kyoto. During the Spanish colonization of the Americas the old Roman city concept was extensively used. Cities were founded in the middle of the newly conquered territories, and were bound to several laws about administration, finances and urbanism.

Most towns remained far smaller places, so that in 1500 only some two dozen places in the world contained more than 100,000 inhabitants: as late as 1700 there were fewer than forty, a figure which would rise thereafter to 300 in 1900. A small city of the early modern period might contain as few as 10,000 inhabitants, a town far fewer still.[citation needed]

Industrial age
Glasgow slum in 1871The growth of modern industry from the late 18th century onward led to massive urbanization and the rise of new great cities, first in Europe and then in other regions, as new opportunities brought huge numbers of migrants from rural communities into urban areas. In the United States from 1860 to 1910, the invention of railroads reduced transportation costs, and large manufacturing centers began to emerge, thus allowing migration from rural to city areas. However, cities during those periods of time were deadly places to live in, due to health problems resulting from contaminated water and air, and communicable diseases. In the Great Depression of the 1930s cities were hard hit by unemployment, especially those with a base in heavy industry. In the U.S. urbanization rate increased forty to eighty percent during 1900-1990. Today the world's population is slightly over half urban, with millions still streaming annually into the growing cities of Asia, Africa and Latin America.

External effects This section may contain original research. Please improve it by verifying the claims made and adding references. Statements consisting only of original research may be removed. (September 2007)

Modern cities are known for creating their own microclimates. This is due to the large clustering of heat absorbent surfaces that heat up in sunlight and that channel rainwater into underground ducts.

Waste and sewage are two major problems for cities, as is air pollution coming from various forms of combustion, including fireplaces, wood or coal-burning stoves, other heating systems, and internal combustion engines. The impact of cities on places elsewhere, be it hinterlands or places far away, is considered in the notion of city footprinting (ecological footprint). Other negative external effects include health consequences such as communicable diseases, crime, and high traffic and commuting times. Cities cause more interaction with more people than rural areas, thus a higher probability to contracting contagious diseases. However, many inventions such as inoculations, vaccines, and water filtration systems have also lowered health concerns. Crime is also a concern in the cities. Studies have shown that crime rates in cities are higher and the chance of punishment after getting caught is lower. In cases such as burglary, the higher concentration of people in cities create more items of higher value worth the risk of crime. The high concentration of people also makes using auto mobiles inconvenient and pedestrian traffic is more prominent in metropolitan areas than a rural or suburban one.

Cities also generate positive external effects. The close physical proximity facilitates knowledge spillovers, helping people and firms exchange information and generate new ideas. A thicker labor market allows for better skill matching between firms and individuals. Another positive external effect of cities comes from the diverse social opportunities created when people of different backgrounds are brought together. Larger cities typically offer a wider variety of social interests and activities, letting people of all backgrounds find something they can be involved in.

Cities may, however, also have a positive influence on the environment. UN Habitat stated in its reports that city living can be the best solution for dealing with the rising population numbers (and thus still be a good approach on dealing with overpopulation) This is because cities concentrate human activity into one place, making the environmental damage on other places smaller.letting the cities have a positive influence; however, can only be achieved if urban planning is improved[32] and if the city services are properly maintained.

Distinction between cities and townsThere are probably as many different ways of conceiving what a city is as there are cities. A simple definition therefore has its attractions. The simplest is that a city is a human settlement in which strangers are likely to meet.

Richard Sennett, The Fall of Public Man, 1977, p. 39.The difference between towns and cities is differently understood in different parts of the world. Indeed, some languages other than English use a single word for both concepts. Iberian languages typically use a three-way designation (Catalan: “poble”, “vila”, “ciutat”; Galician: “aldea”, “vila”, “cidade”; Portuguese: “aldeia”, “vila”, “cidade”; Spanish: “pueblo”, “villa”, “ciudad”—respectively “village”, “town”, “city”); Italian: “villaggio”, "paese" “città”—respectively “village”, "village/town", “city/town”; , but other Romance languages don’t (French: “village”, “ville”).

Even within the English-speaking world there is no one standard definition of a city: the term may be used either for a town possessing city status; for an urban locality exceeding an arbitrary population size; for a town dominating other towns with particular regional economic or administrative significance. In England, city is reserved for very large settlements and smaller historic settlements with a Cathedral (e.g. Lichfield), while smaller settlements without a Cathedral are called towns, and smaller still are villages and hamlets.In the US city is used for much smaller settlements.

Although city can refer to an agglomeration including suburban and satellite areas, the term is not usually applied to a conurbation (cluster) of distinct urban places, nor for a wider metropolitan area including more than one city, each acting as a focus for parts of the area. And the word "town" (also "downtown") may mean the center of the city.

Australia
Canberra - the new capital of Australia that was planned by Marion Mahony Griffin and Walter Burley GriffinAustralia's most populous urban areas are Sydney, Melbourne, Brisbane, Perth and Adelaide.

The official term "city" is given to any Australian statistical division with a minimum of 10,000-30,000 people (varying by state); which is defined either as a contiguous urban area or a local government area (LGA).

For instance, within the wider urban area known as Perth, Australia's fourth most populous urban area, the City of Perth is a relatively small LGA geographically speaking, which also includes the Perth CBD. Informally, in Australian English the word city is used by Australians to describe the most prominent Central Activities District in their proximity. Some local areas containing such activities districts have ambiguous titles that actually use the word city either as or in their title, for instance for a long time the central locality of Brisbane and Canberra are officially simply "City".[35] Due to Australia's high urbanisation, this often refers to the state's capital city. For example, residents of Mandurah saying "going to the city" is more likely to mean the Perth CBD but almost never in the context of the City of Perth. Conversely, residents of Townsville would likely be referring to the Townsville CBD than City of Townsville or Brisbane.

Local government in Australia can apply for City Status. Prior to the Federation of Australia, local councils from the Australian colonies applied directly to the Monarchy of the United Kingdom and were proclaimed a city, a title of some prestige, was assessed on factors such as area, population and rateable revenue. Since the start of the 20th century, local government acts in each state specify the criteria and thresholds and applications are made to the Governors of the Australian states. Population thresholds currently exist under Local government acts in most states including New South Wales (1919 - 25,000); South Australia (22,000); Western Australia (30,000)[38] and Tasmania (10,000). In Victoria under the Local Government Act 1989 where until recently city status was based on rateable revenue, there is no current minimum threshold, however applications must be assessed to be "predominantly urban in character" rather than on population. Today successful application may result in additional state or federal attention for additional funds for infrastructure. However for various reasons, some councils neither seek or receive city status: for instance, Shire of Melton – in Melbourne's west – with a population of over 80,000 (2012) decided after several years of community consultation to defer applying for city status until it reaches 150,000.

Some former satellite cities have merged into larger cities (for instance, Ipswich, Queensland and Dandenong, Victoria), informally they are sometimes still called cities, although according to the Australian Bureau of Statistics they are officially only part of a larger metropolitan area or conurbation and as such are sometimes called Activity Centres by planners.