Population Distribution in the World

• Population distribution is the spatial pattern in which people are spread over the earth’s surface: where they cluster, where they thin out and where they are absent.
• The pattern is highly uneven. A few areas hold very many people and very large areas hold almost none. In 2024 the 8.2 billion people of the world were concentrated in monsoon Asia, Europe, eastern North America and a few river valleys and coasts.
• Distribution is the outcome of physical, economic, historical and political factors acting together, and it keeps changing as world population grows at different rates in different regions.

Describing Distribution

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Distribution and Density

• Distribution answers where people live: the arrangement of people over space, with its clusters, dispersion and empty areas.
• Density answers how many live on a unit of land: persons per km². Distribution is described with density figures but is a wider idea, covering pattern and shape as well as intensity.

Methods of Showing and Measuring Distribution

• Percentage share: each unit’s population as a share of the total.
  • Simple and good for comparing size, but it ignores the area of each unit and says nothing about pattern within it.
• Dot maps: each dot stands for a fixed number of people, placed where they live.
  • They show clustering and emptiness most realistically, especially when large cities are shown by proportional circles.
• Choropleth and gridded maps: shading of administrative units, or of uniform grid cells, by density.
  • Henry Drury Harness’s 1837 maps of population for the Irish railway commissioners were among the first such density maps.
  • Large units hide internal contrasts. Gridded datasets built from census units and satellite imagery now map people at 1 km or finer.
• Centrographic measures:
  • The mean centre of population is the point of balance of a country’s people. The USA’s mean centre has drifted west and south-west since 1790 and lay near Hartville, Missouri, in 2020.
  • The standard distance measures how widely people are dispersed around that centre.
• Indices of concentration:
  • The concentration ratio compares a unit’s share of population with its share of area; values above 1 mean concentration.
  • The Lorenz curve of cumulative population against cumulative area, with its Gini-type coefficient, summarises unevenness for a whole country.

Patterns of World Distribution

• Humanity took the whole of prehistory and history to reach 1 billion, around 1804, and only about 200 years more to reach 7 billion (2011). Most of that growth was added in regions that were already crowded, so unevenness has deepened over time.
• The broad reasons for the pattern:
  • Physical: people favour lowlands, river valleys, deltas and coasts with water, fertile soils and moderate climates, and avoid ice, desert, high mountains and dense rainforest.
  • Historical: the oldest farming civilisations of Asia, the Nile and Europe have had the longest time to accumulate people.
  • Economic: industry, mining, trade and services concentrate people in cities and ports.
  • Political and demographic: borders, policy, conflict, fertility and migration redistribute people over time.

Distribution by Continent

• Asia is the demographic core of the world.
  • It held about 4.8 billion people, 59% of humanity, in 2024, on only about 24% of the world’s land.
  • China and India together hold 35% of the world’s people. Indonesia, Pakistan and Bangladesh add another 9%.
• Africa is second, with about 1.5 billion (19%).
  • It is the fastest-growing continent and is projected to hold over a third of humanity by 2100.
  • Its people cluster in the Nile valley, the West African coast and Nigeria, the East African highlands around Lake Victoria and the Ethiopian plateau. The Sahara, Kalahari and Congo forest are thinly settled.
• Europe (including Russia) holds about 745 million (9%), a share that is falling as its population stagnates and declines.
  • Its densest belt runs from south-east England through the Low Countries and the Rhine–Ruhr to northern Italy. Scandinavia’s north and European Russia’s north-east are sparse.
• Latin America and the Caribbean hold about 660 million (8%), mostly on the coasts and in highland basins; the Amazon interior is nearly empty.
• Northern America (the USA and Canada) holds about 385 million (5%). Its growth comes largely from immigration.
  • Population concentrates in the Boston–Washington megalopolis, the Great Lakes, Florida, Texas and California; Canadians live mostly in a narrow belt near the US border.
• Oceania holds only about 46 million (under 1%). Australia’s people live mainly on its south-eastern and south-western coasts.
• Antarctica has no permanent population. A few thousand scientists live at research stations in summer and about a thousand in winter.
• Six of the seven continents are permanently inhabited on a large scale.

Concentration in a Few Countries

• The ten most populous countries hold about 57% of the world’s people: India (1.45 billion), China (1.42 billion), the USA, Indonesia, Pakistan, Nigeria, Brazil, Bangladesh, Russia and Ethiopia (2024).
• India overtook China as the most populous country in 2023.
• At the other end, dozens of small island states and microstates have fewer than a million people each.
• The mismatch between land and people is the essence of uneven distribution.
  • Asia and Africa hold about 77% of the world’s people on 47% of its land.
  • Europe, the Americas and Oceania hold 53% of the land but only 23% of the people.
• The broad rule holds at every scale: a few areas have many people, and many areas have few.
• Unevenness inside large countries is as striking as between them:
  • China: the Hu Line (from Heihe in the north-east to Tengchong in the south-west), drawn by Hu Huanyong in 1935, divides the country into an eastern part with about 94% of the people on about 43% of the land, and a dry, high western part with the rest.
  • Egypt: the Nile valley and delta against the empty Western Desert.
  • Russia: most people live west of the Urals, while Siberia is thinly settled.
  • Brazil and Australia: people crowd the eastern coasts. Brazil built Brasília (1960) partly to draw settlement inland.

Latitudinal Distribution

• Population is strongly concentrated by latitude, because climate, landmass and the history of settlement all vary with distance from the equator.
• Northern Hemisphere: about 87% of the world’s people live north of the equator (gridded population data, 2015).
  • It contains about 68% of the world’s land.
  • Its middle latitudes have the most favourable climates for farming: monsoon, humid subtropical, Mediterranean and marine west coast.
  • It was the home of the early river civilisations (Nile, Mesopotamia, Indus, Huang He) and of later industrialisation.
• Southern Hemisphere: only about 13%.
  • Oceans dominate it, and much of its land is desert (Australia, Kalahari) or rainforest (Amazon, Congo).
• By latitude band (share of world population, 2015):

• The single most crowded one-degree band is 25°–26°N, with about 250 million people. Half of humanity lives south of about 26°N.
• The equatorial belt itself is relatively thin, because of dense rainforest (Amazon, Congo), leached laterite soils, heat, humidity and disease. Java and Singapore are exceptions.
• Why the bands differ:
  • 20°–40°N combines monsoon rain, fertile river plains (Ganga, Yangtze, Huang He, Nile, Indus) and the world’s oldest civilisations, with modern trade and industry on top.
  • 40°–60°N carries the industrial and urban populations of Europe, North America and north China. It is temperate and well served by infrastructure, but colder and with shorter growing seasons.
  • North of 60°N, severe cold, long winters, permafrost and isolation leave only mining and port settlements.
• The core of world population is therefore subtropical, not temperate: it lies in the monsoon lands between the Tropic of Cancer and 40°N.

Hemispheres and Quadrants

• Eastern vs Western Hemisphere: about 82% of people live east of the Greenwich meridian.
  • Eurasia and Africa form one connected land mass with the oldest centres of farming and the largest populations (India, China, Indonesia, Pakistan, Bangladesh).
  • The Western Hemisphere (mainly the Americas) holds about 18%.
    • Its dense populations are confined to the eastern USA, the Gulf and Pacific coasts, the Mexican plateau and the Brazilian coast.
    • Settlement by farmers from outside came late, and the Amazon and Andes form large empty areas.
• Combining the two divisions:
  • The north-eastern quadrant holds about three-quarters of humanity: South Asia, East Asia and Europe. It has fertile soils, a long history of intensive farming, dense urban–industrial networks and high connectivity.
  • The south-western quadrant holds under 5%: South America and the South Atlantic. It is mostly ocean, with large forests, deserts and mountains.
• The southern continents share one pattern: South America, Africa south of the equator and Australia.
  • People cluster on the coastal margins and in highlands, especially the eastern and south-eastern coasts: south-east Brazil, the Río de la Plata, the Highveld and Cape, south-east Australia.
  • Their interiors are empty: west-coast deserts formed by cold currents and subtropical high pressure (Atacama, Namib, western Australia), and equatorial forest (Amazon, Congo).
  • Colonial settlement was port-based and export-oriented, so one or two coastal cities dominate each country.
  • These continents are narrower towards the south, so less land lies in the mid-latitude belt that elsewhere carries most people.
• In core–periphery terms, the northern and eastern lands form the demographic core, and the southern and western lands the periphery.

Altitudinal Distribution

• Population falls sharply with altitude, because temperature, oxygen, the growing season and accessibility all decline upward. The fall is faster than that of land area.
• Evidence from global census mapping (data for 1994):
  • About one-third of humanity (33.5%) lived within 100 m of sea level, on only 16% of the inhabited land.
  • About three-quarters lived below 500 m.
  • The median person lived at 194 m, while the median inhabited square kilometre lay at 408 m.
  • Only about 7% lived above 1500 m.
• Lowlands (below 200 m): coastal plains, river valleys and deltas, the most crowded lands on earth.
  • Examples: the Ganga–Brahmaputra delta, the eastern China plains, the North European Plain, the Nile delta.
  • They offer fertile alluvium, water, flat land for fields and roads, and early urban growth.
• Middle elevations (200–1500 m): plateaus and interior plains such as the Deccan and the Brazilian Highlands.
  • Densities are moderate and depend on soil, rainfall, irrigation and minerals.
• High altitudes: thin air, cold, short seasons, steep slopes and poor access keep the Himalaya, Tibet, Andes, Rockies and Alps thinly peopled.
  • The Tibetan Plateau averages about 3 persons per km², one of the emptiest settled regions of Asia.
• Exceptions arise where height eases tropical heat, or where people have adapted:
  • The Mexican plateau around 2200–2300 m, with Mexico City at about 2240 m.
  • The Ethiopian and East African highlands: Addis Ababa at about 2350 m and Nairobi at about 1800 m.
  • The Andes: La Paz at about 3640 m, Quito and Bogotá above 2500 m; terraced farming and mining.
  • Tibet and Ladakh pastoralism; Kashmir valley and Himachal agriculture and tourism.
  • These show both the limits set by environment and the room for human adaptation (possibilism).

Coastal Concentration

• People cluster near the sea for trade, fishing, mild climates and lowland farming.
  • About 39% of the world’s people live within 100 km of the coast, 51% within 200 km and 68% within 400 km (2010).
  • The near-coast zone (within 100 km of the sea and below 100 m) holds about 27% of people on 9% of the land.
  • About 5.6% live less than 5 m above sea level, the people most exposed to sea-level rise and storm surges.
• Coastal concentration is old (port cities, deltas) but has been reinforced by globalisation and coastal megacities: Shanghai, Mumbai, Lagos, Jakarta, Dhaka.

Ecumene and Non-Ecumene

• The habitable world is divided into:
  • The ecumene: areas of permanent settlement, where favourable physical and economic conditions support population.
  • The non-ecumene (anecumene): areas with extreme environmental constraints, where permanent settlement is absent or very sparse.
  • The sporadic ecumene: an intermediate category of mostly empty land with isolated pockets of dense settlement.
• The division links density to climate, relief, resources and technology. The ecumene has expanded over time as technology has opened deserts, tundra and mountains.
• In practice the boundary is drawn with population density: very low densities, under about 1 person per km², mark the non-ecumene.

Regions of Agglomeration (High Density)

• Most of humanity lives in a few great clusters:
  • East Asia: eastern China, Korea and Japan.
  • South Asia: the Ganga plain, coastal India, Bangladesh and the Indus plain.
  • South-East Asia: Java, the Red River and Mekong deltas, central Thailand and Luzon.
  • Western and Central Europe.
  • North-eastern North America: the Atlantic seaboard and the Great Lakes.
  • The Nile valley and delta.
  • West Africa: southern Nigeria and the Guinea coast.
  • Metropolitan regions and some islands elsewhere.
• Monsoon Asia (East, South and South-East Asia) is the largest cluster.
  • Monsoon rain supports wet-rice (paddy) cultivation, which is labour-intensive and feeds very large numbers per hectare.
  • Fertile alluvial floodplains and deltas (Ganga, Yangtze, Mekong) allow two or three crops a year.
  • A long agrarian history built dense village networks. Demographic momentum keeps adding numbers.
• The Nile valley is a classic linear agglomeration.
  • Nearly all Egyptians live on the few per cent of the country’s land along the valley and delta.
  • The densities there are among the highest of any farming region, sustained by fertile silt and canal irrigation in a desert.
  • The sharp edge between valley and desert shows how a single factor, water, controls settlement.
• Western Europe, Japan and north-eastern North America reflect economic agglomeration more than physical advantage:
  • Early industrialisation and urbanisation.
  • Dense transport networks and infrastructure.
  • Better health, nutrition and living standards.
  • Strong pull for in-migration.
• Metropolitan concentration (primacy): in some countries a single city region dominates.
  • Mexico City holds about a sixth of Mexico’s people, Lima about a third of Peru’s and Santiago about two-fifths of Chile’s.
  • Sydney and Melbourne together hold about two-fifths of Australia’s people.
• Densely settled islands owe their numbers to location, trade and economic development:
  • Singapore, Hong Kong, Bahrain, Malta, the Maldives and Mauritius.
  • Java, Puerto Rico and Jamaica in the tropics.

Regions of Moderate Density

• Lands that are neither very favourable nor very hostile:
  • Savanna lands of Brazil, northern Australia and Africa.
  • Plateaus with tropical climates moderated by height.
  • Sub-humid fertile regions and temperate grasslands (Prairies, Pampas, the Ukrainian and Russian steppe).
• The temperate grasslands of the “new world” were settled late, mainly by immigrants after the 18th century. They are productive but much less crowded than the old farming lands of Asia.
• Australia and New Zealand stay moderately populated because of the limited carrying capacity of their interiors, despite developed economies.

Non-Ecumene: Sparse and Empty Lands

• Equatorial rainforests: the Amazon, Congo basin and Borneo.
  • Heat, humidity and heavy rain sustain dense, nearly impenetrable forest (selvas).
  • Leached, infertile soils and disease discourage settlement.
  • Exceptions: Singapore, and Java with its fertile volcanic soils.
• High latitudes (north of about 60°N): northern Canada, Alaska, Siberia, Greenland.
  • Temperatures stay below freezing for most of the year. Permafrost, blizzards and the absence of soil and farming keep numbers tiny.
  • Pockets of population owe everything to resources: iron ore at Kiruna (Sweden), gold in the Yukon and at Fairbanks (Alaska), gold at Magadan and nickel at Norilsk in Siberia, oil and gas in western Siberia.
• Hot deserts: the Sahara (about 9 million km²), Arabia, the Thar’s western margins, the Kalahari, central Australia.
  • Scanty rain, sand and stone surfaces, deep water tables and scarce vegetation.
  • Settlement is limited to oases and resource towns: gold at Kalgoorlie (Australia), oil in Libya and the Arabian Peninsula.
• Taiga (boreal forest), roughly between 50°N and 70°N in Canada and Siberia.
  • Dense coniferous forest, acidic podzol soils, long harsh winters and short summers.
• High mountains and plateaus above about 4000 m.
  • Cold, steep slopes and thin soils. Tibet averages about 3 persons per km².

Sporadic Ecumene

• Large areas remain empty while small points are crowded.
  • Examples: the oases of North Africa and West Asia, mining and oil towns, isolated river towns of the Amazon and Congo (Manaus, Kisangani).
• Drivers:
  • Minerals: Kiruna, Norilsk, uranium mining in the Namib (Namibia).
  • Energy: the Persian Gulf shoreline, Sakhalin oil and gas.
  • Sea routes and ports of call: Singapore, Honolulu, Panama, Port Said.
  • Favourable micro-environments in hostile zones: highland capitals such as Addis Ababa, Nairobi, La Paz and Sana’a.
  • Capital and technology: Gulf cities such as Dubai and Doha have grown to millions in the desert on oil wealth, desalinated water and air-conditioning, a clear case of technology widening the ecumene.

Changing Distribution

• The centre of gravity is shifting south and towards Africa. Africa’s share of world population rose from 9% in 1950 to 19% in 2024; Europe’s fell from 22% to 9%.
• Fertility differences drive the shift. With about 4.3 births per woman in Sub-Saharan Africa against 1.3–1.6 in East Asia and Europe (2023), each region’s share of humanity is being redrawn within one or two generations.
• Urbanisation concentrates people further. More than half of humanity now lives in towns and cities, many of them coastal.
• Frontier settlement continues in sparsely populated areas through resource extraction, roads and irrigation (Amazonia, Siberia, the Gulf states, the Indira Gandhi Canal command in the Thar).
  • This brings ecological damage, climate vulnerability and conflicts over land with indigenous peoples.
• Climate change may redraw the ecumene: low-lying deltas and small islands face sea-level rise, while some high-latitude lands become more habitable.
• Behind all these shifts lie the same factors of distribution and density: physical limits, economic opportunity, history and policy.