2.1 The People Are the Real Wealth

The people of a country are its real wealth. It is they who are the actual resources and who put the country's other resources — its land, water, minerals and forests — to use. It is they who frame its policies and live by them. Ultimately, a country is known by its people. To plan for them, a geographer must first ask the simplest of questions: how many women and men live in a country, how many children are born each year, how many people die and how, do they live in cities or villages, can they read and write, and what work do they do?

The world at the beginning of the 21st century recorded the presence of more than 6 billion people. By the year 2024, this figure has crossed 8 billion. In this chapter we ask the first two questions head-on: where do these billions live, and how thickly do they crowd the land they occupy?

2.2 Patterns of Population Distribution in the World

Patterns of population distribution^? and population density^? together help us understand the demographic character of any region. The term population distribution refers to the way people are spaced over the earth's surface. The remark of the geographer George B. Cressey about Asia — that "Asia has many places where people are few and few places where people are very many" — applies just as truly to the planet as a whole.

Two cross-checks will show you just how uneven this distribution is. First, the continental count: Asia alone is home to roughly 60 per cent of the world's people on about 30 per cent of the land. Second, the country count: the 10 most populous countries together hold about 60 per cent of humanity, and six of those ten lie in Asia. China and India alone account for nearly 36 per cent of the planet's people — more than one in every three.

Most Populous Countries — Chart.js Comparison

Figure 2.1: Approximate population (in millions) of the ten most populous countries — six of them in Asia. China and India together house roughly 36% of humanity.

SVG Map — Densely vs Sparsely Populated Belts of the World

Figure 2.2: A schematic world map. Densely populated belts hug river valleys (Ganga, Yangtze, Nile, Rhine) and well-watered plains; sparse belts coincide with the Sahara, Atacama, the Australian Outback, polar Greenland and Antarctica.

2.3 Density of Population

Each unit of land has a limited capacity to support people. Hence, alongside where people live, geographers ask how many people the land has to feed and house per square kilometre. The ratio of the number of people to the size of the land they occupy is called the density of population. It is usually measured in persons per square kilometre.

The world average density is roughly 62 persons per sq km. But the global average hides extraordinary extremes. Compare the figures below — the difference between the most crowded and the most empty places on earth is more than thirty thousand-fold.

Figure 2.3: Selected national densities. Bangladesh is roughly 36,000 times denser than Greenland.

2.4 Factors Influencing the Distribution of Population

Why do humans bunch up in some pockets and shun others? Geographers group the answers into three families: geographical, economic, and social–cultural factors. The same factor that magnetises millions in one decade can repel them in another, depending on technology and policy. Yet certain patterns recur reliably enough to be treated as broad rules of thumb.

I. Geographical Factors — In Detail

(i) Availability of Water

Water is the most important factor for life. It is needed not just for drinking, bathing and cooking but also for cattle, crops, industries and navigation. People therefore prefer to live where fresh water is easily available. It is precisely for this reason that river valleys — the Ganga, Indus, Brahmaputra, Nile, Yangtze, Mekong and Rhine — are among the most densely populated areas of the world.

(ii) Landforms

People prefer living on flat plains and gentle slopes, because such terrain favours the production of crops and the building of roads, factories and cities. Mountainous and hilly areas hinder transport networks and slow down agricultural and industrial development; hence, they tend to be less populated. The Ganga plains are among the most densely populated areas of the world, while the mountain zones in the Himalayas are scarcely populated.

(iii) Climate

An extreme climate — very hot or very cold deserts — is uncomfortable for human habitation. Areas with a comfortable climate, where there is little seasonal variation, attract more people. Regions with very heavy rainfall or with extreme and harsh climates have low populations. The Mediterranean region has been inhabited from very early periods in history because of its pleasant climate.

(iv) Soils

Fertile soils are essential for agricultural and allied activities. Therefore, areas which have fertile loamy soils have more people living on them, because such soils can support intensive agriculture. Conversely, regions with poor lateritic, saline or rocky soils have thin populations.

II. Economic Factors — In Detail

(i) Minerals

Areas with mineral deposits attract industries. Mining and the industries that grow up around it create employment, so skilled and semi-skilled workers move into these zones and make them densely populated. The Katanga–Zambia copper belt in Africa is a good example of this kind of mineral-led population concentration.

(ii) Urbanisation

Cities offer better employment opportunities, educational and medical facilities, better means of transport and communication. Good civic amenities and the simple attraction of city life draw people from villages. This rural-to-urban migration causes cities to swell — and the world's mega cities continue to attract large numbers of migrants every year. Yet city life can be very taxing — long commutes, expensive housing, pollution and impersonal social life are some of its unpleasant aspects.

(iii) Industrialisation

Industrial belts provide job opportunities for far more than just factory workers. They draw transport operators, shopkeepers, bank employees, doctors, teachers and a long list of other service providers. The Kobe–Osaka region of Japan is densely populated precisely because it hosts a large number of industries.

III. Social and Cultural Factors

Some places attract more people because they hold religious or cultural significance — Varanasi, Tirupati, Vatican City, Mecca and Madinah have all built dense permanent populations around their pilgrim economies. Conversely, people tend to move away from places where there is social and political unrest — civil wars, communal tensions and persecution. Many a time, governments offer incentives for people to live in sparsely populated areas (such as India's hill state subsidies) or move away from overcrowded ones (such as urban decongestion drives).

Densely & Sparsely Populated Regions of the World — Summary Table

2.5 Why Distribution Matters — A Geographer's Reflection

The distribution of people is far more than a curiosity of demography. Roads, schools, hospitals, water-supply pipelines and electricity grids are all sized to the population they serve. A government that builds infrastructure on the assumption of even spread will under-supply Bangladesh and waste investment on Mongolia. Climate and disaster planning is similarly density-sensitive — a flood on the Ganga plains threatens millions, while the same flood in Greenland would barely make the news. Even cultural exchange — the spread of languages, cuisines and religions — has historically followed corridors of dense settlement; isolated populations preserve archaic traits, while densely connected ones blend rapidly.

Population distribution is therefore the silent skeleton of every other human geographical study you will encounter in this book — migration, settlement, transport, services, industry. The first task of any geographer is to know where the people are. The next, taken up in the following parts of this chapter, is to ask how the numbers are changing.