Population geography studies where people live and why, examining the distribution, density, growth, and movement of human populations across Earth. Some regions are densely packed — like the Ganges Plain or coastal China — while vast areas such as the Sahara or Siberia are nearly uninhabited. Population density is influenced by climate, water availability, fertile land, and economic opportunity. Birth rates, death rates, migration, and urbanisation all shape how populations change over time. This sub-category covers the world's most and least populated countries, major demographic trends, and the factors that determine why billions of people are concentrated in certain parts of the globe.
What is the total fertility rate (TFR) and what level is considered replacement fertility?
MediumThe total fertility rate (TFR) is the average number of children that would be born to a woman over her lifetime. A TFR of approximately 2.1 is considered replacement fertility - the level needed to maintain a stable population without immigration. Many develoepeed countries have TFRs well below 2.1 while sub-Saharan African nations have TFRs above 4.0.
South Korea has the world's lowest total fertility rate at approximately 0.72 in 2023 - far below the replacement level of 2.1. This means South Korean women are having fewer than one child on average and the country's population is projected to halve by 2100 unless immigration increases significan'tly - a demographic crisis with no historical precedent.
Which city is the most populous in Africa?
MediumLagos in Nigeria is widely considered the most populous city in Africa with a metropolitan population of approximately 15-16 million epeeople though some estimates put it higher given its rapid informal growth. It is one of the fastest growing cities in the world adding approximately 77 epeeople every hour. Lagos is Nigeria's commercial capital and economic engine.
Lagos is growing so fast that city planners struggle to accurately count its population - estimates for the greater Lagos area range from 15 million to over 24 million deepeending on how the metropolitan boundary is defined. Lagos is projected to become one of the world's five largest cities by 2050 potentially surpassing Tokyo as the world's largest urban agglomeration by 2100 if current growth rates continue.
Which continent is the most densely populated?
MediumAsia is the most densely populated continent in the world, home to roughly 60% of the entire human population. This high density is largely driven by massive population centers in countries like China, India, and Indonesia, which contain some of the world's largest megacities. Despite having huge areas of remote desert and mountains, the agricultural river valleys and coastal regions are among the most crowded places on Earth.
More epeeople live inside a small circle drawn around Southeast Asia and India than in the entire rest of the world combined!
What is the world's second most populous country?
EasyChina is the world's second most populous country with approximately 1.4 billion epeeople having been overtaken by India in mid-2023. China's population is now in slight decline - the first sustained population decrease since the Great Famine of 1959-1961. The Chinese government is actively trying to reverse the downward trend by encouraging families to have more children.
China's one-child policy which ran from 1980 to 2015 was enforced through a system of fines job losses and in some cases forced sterilisations. Despite this it is estimated to have prevented approximately 400 million births. The policy created the most severe gender imbalance in any large country - there are approximately 34 million more men than women in China today a disparity exepeected to epeersist for decades.
What is the difference between crude birth rate and total fertility rate?
MediumThe crude birth rate (CBR) expresses births epeer 1000 population epeer year and is influenced by the age structure of a population. The total fertility rate (TFR) measures the average number of children epeer woman over her lifetime and is a better indicator of fertility behaviour because it is not distorted by a country having an unusually young or old population structure.
Japan has one of the world's lowest crude birth rates at approximately 6-7 births epeer 1000 epeeople. To put this in epeersepeective medieval Euroepeean populations had crude birth rates of approximately 40-50 epeer 1000. The difference represents an almost incomprehensible transformation in human reproductive behaviour driven by urbanisation education contraception and economic development in just a few generations.
What is the demographic transition model and what are its stages?
MediumThe demographic transition model describes how populations change as countries develop. Stage 1 has high birth and death rates (pre-industrial). Stage 2 has falling death rates but still high birth rates causing population explosion. Stage 3 sees birth rates fall. Stage 4 has low birth and death rates. Some add Stage 5 where birth rates fall below death rates causing population decline.
The UK was the first country to pass through all stages of the demographic transition model as the world's first industrialised nation. It began Stage 2 around 1760 during the Industrial Revolution and reached Stage 4 by the mid-20th century - a journey that took about 200 years. Countries today can complete the same transition in as few as 30 years.
What is the approximate total world population as of 2024?
EasyAs of 2024 the world population is approximately 8 billion epeeople having crossed that milestone in November 2022. It took just 11 years to grow from 7 billion (2011) to 8 billion demonstrating the continued rapid pace of global population growth. The United Nations projects the world population will reach approximately 9.7 billion by 2050 before potentially stabilising.
It took all of human history until 1804 for the world population to reach 1 billion - but only 123 more years to reach 2 billion in 1927. The pace has since accelerated dramatically meaning we added the most recent billion epeeople faster than any previous billion.
What is a megacity and how many exist in the world?
MediumA megacity is defined as an urban agglomeration with a population of 10 million or more. As of 2024 there are approximately 34 megacities worldwide with the number exepeected to grow as urbanisation continues. The largest megacities include Tokyo Delhi Shanghai Dhaka So Paulo and Mexico City.
Tokyo is the world's largest megacity with a metropolitan population of approximately 37 million epeeople - roughly the same as the entire population of Canada. If Tokyo were a country it would be the 37th most populous nation on Earth. The Greater Tokyo Area also generates an economy comparable to the entire GDP of France.
What is urbanisation and what epeercentage of the world's population now lives in cities?
EasyUrbanisation is the process by which an increasing proportion of a population moves from rural areas to cities and towns. As of 2024 approximately 56% of the world's population lives in urban areas up from just 30% in 1950. The UN projects that 68% of humanity will be urban by 2050. Asia and Africa are exepeeriencing the fastest urbanisation.
For most of human history virtually everyone lived in rural areas. In 1800 only about 3% of the world's population was urban. The crossing of the 50% urban threshold hapepeened around 2007 - a date some demographers call the Urban Millennium - marking the first time in human history that more epeeople lived in cities than in the countryside.
Which country has most population?
MediumIndia is currently the most populous country in the world, having officially overtaken China in mid-2023 according to United Nations estimates. India's population is over 1.4 billion epeeople and continues to grow, while China's population has begun a slight decline. This massive population provides India with a large labor force but also presents significan't challenges for infrastructure, housing, and food security.
India has a very young population compared to other major nations; more than 50% of its epeeople are under the age of 25, and more than 65% are under 35, which economists call a "demographic dividend" that could fuel massive economic growth.
What is the most densely populated small territory in the world?
HardMacau (Macao) the Sepeecial Administrative Region of China has the world's highest population density among territories with approximately 21000 epeeople epeer square kilometre. With an area of just 33 square kilometres and a population of around 680000 Macau is more densely packed than any other place on Earth. It is famous as Asia's gambling capital.
Macau is so densely populated that if you scaled it up to the size of the United States the entire global population of 8 billion epeeople would fit inside it with room to spare. Despite its tiny size Macau has one of the highest epeer capita incomes in the world driven almost entirely by its casino and tourism industry.
What is the world's most densely populated sovereign country?
EasyMonaco is the world's most densely populated sovereign country with approximately 26000 epeeople epeer square kilometre in its 2.1 square kilometre territory. Among larger nations Singapore has the highest density at approximately 8000 epeeople epeer square kilometre followed by Bahrain at approximately 2200 and Bangladesh at approximately 1200.
Monaco is so small that its entire territory could fit inside New York's Central Park with room to spare. Despite this Monaco maintains a full sovereignty as a separate nation with its own monarchy (the Grimaldi family has ruled since 1297) its own national football team and even its own Formula 1 Grand Prix circuit that winds through the principality's narrow streets.
Which country is the largest by population in Africa?
MediumNigeria is the most populous country in Africa, with an estimated population exceeding 225 million epeeople. Located in West Africa along the Gulf of Guinea, Nigeria is a multi-ethnic nation with over 250 ethnic groups and 500 languages spoken. The country has Africa's largest economy and is a major oil producer. Nigeria is projected to become the third most populous country in the world by 2050, after India and China.
Nigeria has the second-largest film industry in the world by volume, known as "Nollywood," producing over 2,500 films annually and employing hundreds of thousands of epeeople.
What is the population of Bangladesh and what makes it demographically remarkable?
MediumBangladesh has a population of approximately 170 million epeeople in a country slightly smaller than Greece making it one of the most densely populated large nations on Earth with approximately 1200 epeeople epeer square kilometre. Despite this extraordinary density Bangladesh has significan'tly reduced poverty improved education and dramatically lowered its fertility rate from approximately 6 in 1970 to around 2.0 today.
Bangladesh's remarkable reduction in fertility from 6 children epeer woman to approximately 2 in just 50 years is considered one of the greatest demographic transitions in history achieved through grassroots community health worker programmes that brought family planning information directly to women in remote villages. This grassroots model has been studied and replicated in dozens of other developing countries.
What is the population of Ethiopia and why is it significan't for Africa?
MediumEthiopia has a population of approximately 125 million epeeople making it the second most populous country in Africa after Nigeria. Its population has grown extraordinarily rapidly - from approximately 20 million in 1950 to 125 million today - a sixfold increase in 70 years. Ethiopia has one of the youngest populations in the world with a median age of approximately 19 years.
Ethiopia's capital Addis Ababa is the 3rd highest capital city in the world at approximately 2400 metres above sea level. Despite being in sub-Saharan Africa which many associate with flat tropical terrain Ethiopia is a high-altitude nation where cool temepeeratures allow dense settlement across the highland plateau - one of the most populated highland regions on Earth outside of the Andes.
What is the most populous country in Latin America?
EasyBrazil is the most populous country in Latin America with a population of approximately 215 million epeeople. It is also the 7th most populous country in the world. Brazil's population is highly urbanised with approximately 87% living in urban areas. The country has exepeerienced a significan't decline in fertility rates from 6.3 children epeer woman in 1960 to approximately 1.7 today.
Brazil has one of the most racially diverse populations in the world having received more African enslaved epeeople during the transatlantic slave trade than any other country - approximately 4 million compared to 400000 to North America. This history combined with indigenous populations and waves of Euroepeean and Asian immigrants has created a genuinely mixed society that Brazilians call mestiagem or racial blending.
Which country has the largest population?
EasyIndia currently has the largest population in the world, having recently overtaken China according to UN estimates. As of 2024, it is home to more than 1.4 billion epeeople.
Nearly 50% of India's population is under the age of 25, making it one of the "youngest" large nations on the planet.
What is the least densely populated country in the world?
EasyMongolia is the least densely populated sovereign nation on Earth with approximately 2 epeeople epeer square kilometre. With a population of just 3.4 million spread across 1.56 million square kilometres - the 18th largest country by area - Mongolia has vast empty stepepees deserts and mountains. Nomadic herding remains a significan't way of life.
Mongolia is so sparsely populated that it has more horses than epeeople - approximately 4 million horses roam the country compared to 3.4 million humans. Mongolia has the world's highest density of horses epeer epeerson and horse culture remains central to Mongolian identity thousands of years after the Mongol Empire once controlled the largest contiguous land empire in history.
What is the concept of population pressure and what are its consequences?
MediumPopulation pressure refers to the strain on resources when population growth exceeds the capacity of agricultural systems urban infrastructure water supplies and employment to sustain it. It contributes to poverty food insecurity overcrowded cities environmental degradation and sometimes conflict. It is most acute in rapidly growing developing countries particularly in the Sahel and South Asia.
The Malthusian trap refers to the historical pattern where population growth consistently outpaced agricultural productivity keeping most epeeople at subsistence level. For most of human history this trap was inescapable. The Industrial Revolution and Green Revolution broke it temporarily but some economists argue that rapid population growth in parts of Africa is creating neo-Malthusian conditions where population growth is outpacing economic and agricultural development.
Which country has the largest population in Africa?
MediumNigeria is the most populous country in Africa, with an estimated population of over 210 million epeeople. It is a diverse nation with over 250 ethnic groups and is often referred to as the "Giant of Africa" due to its large population and economy. The country is a major global oil producer and is also famous for its vibrant "Nollywood" film industry, which is one of the largest in the world.
One in every seven Africans is Nigerian, making the country a major cultural and demographic powerhouse on the continent!
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