Population density (people per km²) by country, 2006

Population density (people per km²) map of the world in 1994 (detailed).

Population density (people per km²) map of the world in 1994.

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.^[1]

Biological population densities[link]

Population density is population divided by total land area.^[1]

Low densities may cause an extinction vortex and lead to further reduced fertility. This is called the Allee effect after the scientist who identified it. Examples of the causes in low population densities include:^[2]

• Increased problems with locating sexual mates
• Increased inbreeding

Different species have different expected densities. R-selected species commonly have high population densities, while K-selected species may have lower densities.^[3] Low densities may be associated with specialized mate location adaptations such as specialized pollinators, as found in the orchid family (Orchidaceae).

Human population density[link]

Monaco in South Europe, currently holds the record for being the most densely populated nation in the world.

Mongolia is the least densely populated country in the world.

A population cartogram uses areas rather than colors to represent population density.

For humans, population density is the number of people per unit of area usually per square kilometer or mile (which may include or exclude cultivated or potentially productive area). Commonly this may be calculated for a county, city, country, another territory, or the entire world.

The world's population is 7 billion,^[4] and Earth's total area (including land and water) is 510 million square kilometers (197 million square miles).^[5] Therefore the worldwide human population density is 6.8 billion ÷ 510 million = 13.3 per km² (34.5 per sq. mile). If only the Earth's land area of 150 million km² (58 million sq. miles) is taken into account, then human population density increases to 45.3 per km² (117.2 per sq. mile). This calculation includes all continental and island land area, including Antarctica. If Antarctica is also excluded, then population density rises to 50 people per km² (129.28 per sq. mile).^[1] Considering that over half of the Earth's land mass consists of areas inhospitable to human inhabitation, such as deserts and high mountains, and that population tends to cluster around seaports and fresh water sources, this number by itself does not give any meaningful measurement of human population density.

Several of the most densely-populated territories in the world are city-states, microstates, or dependencies.^[6][7] These territories share a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation.

Cities with high population densities are, by some, considered to be overpopulated, though the extent to which this is the case depends on factors like quality of housing and infrastructure and access to resources.^[8] Most of the most densely-populated cities are in southern and eastern Asia, though Cairo and Lagos in Africa also fall into this category.^[9]

City population is, however, heavily dependent on the definition of "urban area" used: densities are often higher for the central municipality itself, than when more recently-developed and administratively separate suburban communities are included, as in the concepts of agglomeration or metropolitan area, the latter including sometimes neighboring cities. For instance, Milwaukee has a greater population density when just the inner city is measured, and not the surrounding suburbs as well.^[10]

As a comparison, based on a world population of seven billion, the world's inhabitants would, as a loose crowd taking up ten square feet per person (Jacobs Method), would occupy a space roughly the size of Fiji's land area.

Ten most densely populated countries[link]

With population above 1 million

Rank	Country/Region	Population	Area (km2)	Density (Pop. per km2)
1	Singapore	5,183,700	710	7301
2	Bahrain	1,234,596	750	1646
3	Bangladesh	142,325,250	147,570	964
4	Mauritius	1,288,000	2,040	631
5	Republic of China (Taiwan)	22,955,395	36,190	634
6	South Korea	48,456,369	99,538	487
7	Rwanda	10,718,379	26,338	407
8	Lebanon	4,224,000	10,452	404
9	Netherlands	16,760,000	41,526	404
10	Israel	7,697,600	20,770	371

With population above 10 million

Rank	Country/Region	Population	Area (km2)	Density (Pop. per km2)
1	Bangladesh	142,325,250	147,570	964
2	Republic of China (Taiwan)	22,955,395	36,190	634
3	South Korea	48,456,369	99,538	487
4	Rwanda	10,718,379	26,338	407
5	Netherlands	16,760,000	41,526	404
6	India	1,210,193,422	3,287,263	368
7	Belgium	11,007,020	30,528	361
8	Japan	127,960,000	377,944	339
9	Sri Lanka	20,653,000	65,610	315
10	Philippines	92,330,000	299,764	308

Other methods of measurement[link]

While arithmetic density is the most common way of measuring population density, several other methods have been developed which aim to provide a more accurate measure of population density over a specific area.

• Arithmetic density: The total number of people / area of land (measured in km² or sq miles).
• Physiological density: The total population / area of arable land.
• Agricultural density: The total rural population / area of arable land.
• Residential density : The number of people living in an urban area / area of residential land.
• Urban density : The number of people inhabiting an urban area / total area of urban land.
• Ecological optimum: The density of population which can be supported by the natural resources.

See also[link]

• Human geography
• Idealized population
• Optimum population
• Population bottleneck
• Population genetics
• Population health
• Population momentum
• Population pyramid
• Rural transport problem
• Small population size
• Distance sampling

Lists:

• List of cities by population
• List of cities by population density
• List of European cities proper by population density
• List of islands by population density
• List of countries by population density
• List of U.S. states by population density

References[link]

External links[link]

• Selected Current and Historic City, Ward & Neighborhood Densities

People's Republic of China 中华人民共和国 Zhōnghuá Rénmín Gònghéguó
Flag National Emblem
Anthem:  "March of the Volunteers" 《义勇军进行曲》 (Pinyin: "Yìyǒngjūn Jìnxíngqǔ")
Capital		Beijing 39°55′N 116°23′E / 39.917°N 116.383°E / 39.917; 116.383
Largest city		Shanghai[1][2]
Official language(s)		Standard Chinese[3]
Recognised regional languages		Mongolian, Tibetan, Uyghur, Zhuang, and various others
Official written language		Vernacular Chinese
Official script		Simplified Chinese[3]
Ethnic groups		91.51% Han;[4] 55 recognised minorities List of ethnic groups 1.30% Zhuang 0.86% Manchu 0.79% Uyghur 0.79% Hui 0.72% Miao 0.65% Yi 0.62% Tujia 0.47% Mongol 0.44% Tibetan 0.26% Buyei 0.15% Korean 1.05% other
Demonym		Chinese
Government		Nominally Marxist–Leninist single-party state[5][a]
-	President[b]	Hu Jintao
-	Congress Chairman	Wu Bangguo
-	Premier	Wen Jiabao
-	Conference Chairman	Jia Qinglin
Legislature		National People's Congress
Establishment
-	Unification of China under the Qin Dynasty	221 BC
-	Republic established	1 January 1912
-	People's Republic proclaimed	1 October 1949
Area
-	Total	9,640,821 km2 [c] or 9,671,018 km² [c](3rd/4th) 3,704,427 sq mi
-	Water (%)	2.8[d]
Population
-	2010 census	1,339,724,852[4] (1st)
-	Density	139.6/km2 (53rd) 363.3/sq mi
GDP (PPP)		2011 estimate
-	Total	$11.299 trillion[6] (2nd)
-	Per capita	$8,382[6] (91st)
GDP (nominal)		2011 estimate
-	Total	$7.298 trillion[6] (2nd)
-	Per capita	$5,413[6] (90th)
Gini (2007)		41.5[7]
HDI (2011)		0.687[8] (medium) (101st)
Currency		Renminbi (yuan) (¥) (CNY)
Time zone		China Standard Time (UTC+8)
Date formats		yyyy-mm-dd or yyyy年m月d日 (CE; CE-1949)
Drives on the		right, except for Hong Kong & Macau
ISO 3166 code		CN
Internet TLD		.cn[c] .中國[9] .中国
Calling code		+86[c]
a. ^ Simple characterizations of the political structure since the 1980s are no longer possible.[10] b. ^ As paramount leader, Hu Jintao holds four concurrent positions: General Secretary of the Communist Party of China, President of the People's Republic of China, and Chairman of the Central Military Commission for both state and party.[11] c. ^ 9,598,086 km2 (3,705,842 sq mi) excludes all disputed territories. 9,640,821 km2 (3,722,342 sq mi) Includes Chinese-administered area (Aksai Chin and Trans-Karakoram Tract, both territories claimed by India), Taiwan is not included.[12] d. ^ Information for mainland China only. Hong Kong, Macau, and territories under the jurisdiction of the Republic of China (Taiwan) are excluded.

China (ⁱ/ˈtʃaɪnə/; Chinese: 中国; pinyin: Zhōngguó; see also Names of China), officially the People's Republic of China (PRC), is the world's most-populous country, with a population of over 1.3 billion. Covering approximately 9.6 million square kilometres, the East Asian state is the world's second-largest country by land area,^[13] and the third- or fourth-largest in total area, depending on the definition of total area.^[14]

The People's Republic of China is a single-party state governed by the Communist Party of China.^[15] It exercises jurisdiction over 22 provinces, five autonomous regions, four directly controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau).^[16] Its capital city is Beijing.^[17] The PRC also claims Taiwan—which is controlled by the Republic of China (ROC), a separate political entity—as its 23rd province, a claim controversial due to the complex political status of Taiwan and the unresolved Chinese Civil War. The PRC government denies the legitimacy of the ROC.

China's landscape is vast and diverse, with forest steppes and the Gobi and Taklamakan deserts occupying the arid north and northwest near Mongolia and Central Asia, and subtropical forests being prevalent in the wetter south near Southeast Asia. The terrain of western China is rugged and elevated, with the Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separating China from South and Central Asia. The world's apex, Mt. Everest (8,848 m), lies on the China–Nepal border, while the world's second-highest point, K2 (8,611 m), is situated on China's border with Pakistan. The country's lowest and the world's third-lowest point, Lake Ayding (−154 m), is located in the Turpan Depression. The Yangtze and Yellow Rivers, the third- and sixth-longest in the world, have their sources in the Tibetan Plateau and continue to the densely populated eastern seaboard. China's coastline along the Pacific Ocean is 14,500 kilometres (9,000 mi) long—the 11th-longest in the world—and is bounded by the Bohai, Yellow, East and South China Seas.

The nation of China has had numerous historical incarnations. The ancient Chinese civilization—one of the world's earliest—flourished in the fertile basin of the Yellow River in the North China Plain.^[18] China's political system was based on hereditary monarchies, known as dynasties, beginning with the semi-mythological Xia of the Yellow River basin (approx. 2000 BC) and ending with the fall of the Qing Dynasty in 1911. Since 221 BC, when the Qin Dynasty first conquered several states to form a Chinese empire, the country has expanded, fractured and been reformed numerous times. The Republic of China, founded in 1911 after the overthrow of the Qing dynasty, ruled the Chinese mainland until 1949. In 1945, the ROC acquired Taiwan from Japan following World War II.

In the 1946–1949 phase of the Chinese Civil War, the Chinese Communist Party defeated the nationalist Kuomintang in mainland China and established the People's Republic of China in Beijing on 1 October 1949. The Kuomintang relocated the ROC government to Taiwan, establishing its capital in Taipei. The ROC's jurisdiction is now limited to Taiwan and several outlying islands, including Penghu, Kinmen and Matsu. Since 1949, the People's Republic of China and the Republic of China (now widely known as "Taiwan") have remained in dispute over the sovereignty of China and the political status of Taiwan, mutually claiming each other's territory and competing for international diplomatic recognition. In 1971, the PRC gained admission to the United Nations and took the Chinese seat as a permanent member of the U.N. Security Council. China is also a member of numerous formal and informal multilateral organizations, including the WTO, APEC, BRICS, the Shanghai Cooperation Organisation, the BCIM and the G-20. As of September 2011, all but 23 countries have recognized the PRC as the sole legitimate government of China.

Since the introduction of market-based economic reforms in 1978, China has become the world's fastest-growing major economy.^[19] As of 2012, it is the world's second-largest economy, after the United States, by both nominal GDP and purchasing power parity (PPP),^[20] and is also the world's largest exporter and second-largest importer of goods. In per capita terms, China ranked 90th by nominal GDP and 91st by GDP (PPP) in 2011, according to the IMF. China is a recognized nuclear weapons state and has the world's largest standing army, with the second-largest defense budget. In 2003, China became the third nation in the world, after the former Soviet Union and the United States, to independently launch a successful manned space mission. China has been characterized as a potential superpower by a number of academics,^[21] military analysts,^[22] and public policy and economics analysts.^[23]

Etymology[link]

China
Chinese name
Simplified Chinese:	中国
Traditional Chinese:	中國
Literal meaning:	Middle Kingdom[24][25]
Transliterations Gan - Romanization: Tung-koe̍t Kejia - Romanization: Dung24 Gued2 Mandarin - Hanyu Pinyin: Zhōngguó - Wade-Giles: Chung-kuo - Bopomofo ㄓㄨㄥ ㄍㄨㄛˊ Min - Hokkien POJ: Tiong-kok - Min Dong BUC: Dṳ̆ng-guók Wu - Romanization: Tson平 koh入 Yue - Jyutping: Zung1 gwok3 - Yale Romanization: Jūnggwok
People's Republic of China
Alternative Chinese name
Simplified Chinese:	中华人民共和国
Traditional Chinese:	中華人民共和國
Transliterations Gan - Romanization: Chungfa Ninmin Khungfokoet Hakka - Romanization: Dung24 fa11 ngin11 min11 kiung55 fo11 gued2 Mandarin - Hanyu Pinyin: Zhōnghuá Rénmín Gònghéguó Min - Hokkien POJ: Tiong-hôa jîn-bîn kiōng-hô-kok - Min Dong BUC: Dṳ̆ng-huà Ìng-mìng Gê̤ṳng-huò-guók Wu - Romanization: Tson平 gho平 zin平 min平 gon去 ghu平 koh入 Yue - Jyutping: Zung1 waa4 jan4 man4 gung6 wo4 gwok3 - Yale Romanization: Jūngwàh Yàhnmàhn Guhngwòhgwok
Mongolian name
Mongolian:
Tibetan name
Tibetan:	ཀྲུང་ཧྭ་མི་དམངས་སྤྱི མཐུན་རྒྱལ་ཁབ
Transliterations - Wylie: krung hwa mi dmangs spyi mthun rgyal khab - Zangwen Pinyin: Zhunghua Mimang Jitun Gyalkab
Uyghur name
Uyghur:	جۇڭخۇا خەلق جۇمھۇرىيىت
Transliterations - Latin Yëziqi: Jungxua Xelq Jumhuriyiti - Yengi Yezik̡: Junghua Həlk̡ Jumh̡uriyiti - SASM/GNC: Junghua Hälk̂ Jumĥuriyiti - Siril Yëziqi: Җуңхуа Хәлқ Җумһурийити
Zhuang name
Zhuang:	Cunghvaz Yinzminz Gunghozgoz

This article contains Chinese text. Without proper rendering support, you may see question marks, boxes, or other symbols instead of Chinese characters.

The word "China" is derived from Cin (چین), a Persian name for China popularized in medieval Europe by the account of the 13th-century Venetian explorer Marco Polo.^[26][27] The first recorded use in English dates from 1555.^[28] The Persian word is, in turn, derived from the Sanskrit word Cīna (चीन),^[29] which was used as a name for China as early as AD 150.^[30] There are various scholarly theories regarding the origin of this word. The traditional theory, proposed in the 17th century by Martino Martini, is that "China" is derived from "Qin" (秦), the westernmost of the Chinese kingdoms during the Zhou Dynasty, or from the succeeding Qin Dynasty (221–206 BC).^[31] The word Cīna is used in two Hindu scriptures – the Mahābhārata of the 5th century BC and the Laws of Manu of the 2nd century BC – to refer to a country located in the Tibetan-Burman borderlands east of India.^[32][33]