The world's least densely populated countries are those in which very few people live relative to the amount of land within the country's territory. Population density is normally calculated as population divided by land area, so countries with enormous territories and comparatively small populations tend to have the lowest densities.
Mongolia is widely recognised as one of the least densely populated sovereign countries in the world, while Australia, Namibia, Canada, Iceland, Guyana, Suriname and Botswana also have very low national densities. Some countries with extremely small populations can have very low density if their territories are relatively large. The reasons for low density vary substantially.
They can include deserts, tundra, extreme cold, mountainous terrain, limited agricultural land, historically low migration, geographic isolation, difficult transport conditions and economic structures that do not require large populations. A low national density does not necessarily mean that people live far apart everywhere, because populations often cluster around a small number of cities, rivers, coasts, fertile regions or transport corridors.
Mongolia is a particularly clear example of low population density because it has a very large land area and a relatively small population. Its landscape includes extensive steppe, desert and semi desert regions, and its traditional pastoral economy has historically involved mobile populations rather than dense permanent settlement.
Australia has an even larger territory and a much larger population than Mongolia, but most Australians live in a relatively narrow band of urbanised and economically productive areas around the eastern, southeastern and southwestern coasts. Canada is similarly vast, but much of its northern territory experiences extremely cold conditions, extensive tundra, permafrost and difficult transport environments. As a result, the country's population is heavily concentrated in southern regions near the United States border. These examples demonstrate why national density is only an average and does not describe the actual spacing of people throughout the country.
Physical geography is one of the strongest influences on very low population density. Extreme heat and aridity can restrict permanent settlement in deserts, while extreme cold can limit agriculture, construction and transportation. Mountainous terrain can make settlement and infrastructure expensive and can isolate communities. Dense forests, wetlands and areas with limited transport access can also reduce permanent settlement.
Namibia contains extensive arid landscapes, including the Namib Desert, while Iceland has a small population distributed across a relatively large island with substantial areas of mountainous and volcanic terrain. These physical conditions do not make settlement impossible, but they affect the cost and practicality of supporting large populations. Modern technology can overcome some geographical constraints through roads, energy systems, water infrastructure, heating, air conditioning and engineering, but those systems require substantial investment and maintenance.
Low population density can have both advantages and disadvantages. Sparse settlement can provide large areas of land for agriculture, grazing, conservation, mining, forestry and other land intensive activities. It can also reduce some forms of urban congestion and provide extensive wilderness or protected areas. However, delivering hospitals, schools, emergency services, telecommunications, electricity and transport infrastructure to scattered populations can be expensive because each facility may serve relatively few people across a large geographic area.
Businesses may also face smaller local markets and greater transportation costs. Remote communities can experience longer travel distances to essential services and greater dependence on transport infrastructure. These effects depend on national wealth, geography, technology and government policy, so low density should not automatically be interpreted as either a social advantage or disadvantage.
Low population density is different from low population size. A country can have a small population but relatively high density if it has very little territory, while a country can have millions of inhabitants and still have a low density because its land area is enormous. Australia illustrates the latter case, while many small island states illustrate the former distinction.
Population density also differs from settlement density because large parts of a country can be empty or nearly empty while a small proportion of the territory contains very dense cities. Geographic information systems and detailed population grids can reveal these internal patterns much more effectively than a single national average. In practice, geographers therefore distinguish between arithmetic density at national level and the density of particular settlements, regions, ecological zones or inhabited areas.
Economic activity strongly influences where people settle in sparsely populated countries. Resource extraction can create concentrated settlements around mines, oil fields, gas fields or timber resources, even where the surrounding region is extremely sparsely populated. Agricultural communities can develop in areas with favourable soils and water, while ports and transport junctions can support towns in otherwise remote regions. Capital cities can become disproportionately large relative to the rest of the country because administrative, commercial and educational functions are concentrated there.
Namibia, for example, has a small population spread across a large territory, but much of the population is concentrated in particular towns and regions rather than being uniformly distributed. The same principle applies to Canada and Australia, where major metropolitan areas contain a large proportion of the national population while enormous territories contain very few permanent residents.
Rankings of the least densely populated countries depend on how geographic units are defined and which territories are included. Greenland has an exceptionally low population density and is geographically enormous, but it is an autonomous territory within the Kingdom of Denmark rather than an independent sovereign country. If territories are included in a global ranking, Greenland becomes an important part of the comparison.
Antarctica has an even more extreme relationship between area and permanent population, but it is not a sovereign country and has no permanent indigenous population. Consequently, discussions of the world's least densely populated countries normally distinguish sovereign states from dependencies, territories and other geographic regions. The reference year also matters because population estimates change over time, although large geographic differences tend to persist.
The concept of low population density is important for understanding settlement geography, regional development, infrastructure planning, environmental conservation and demographic change. Sparse populations can make governments responsible for unusually large geographic areas while serving relatively small numbers of residents. Population decline can make an already low density even lower, particularly in remote regions affected by migration and ageing. Conversely, economic development, immigration, urban expansion and infrastructure investment can increase population concentration in selected regions without substantially changing national density.
The central point is that low density describes the relationship between population and territory, not the quality of life or economic performance of a country. A complete interpretation requires consideration of physical geography, settlement distribution, transport networks, economic activity, historical development, demographic trends and the difference between national averages and local population concentrations.
