This is the full-content study version of "Patterns of Settlement" — a core spatial pattern in the People, Patterns and Processes focus area. It traces how humans went from scattered villages to a majority-urban planet of mega-cities, and why cities sit where they do. Read it, then use the activity sheet and the topic study guide to revise.
Syllabus: spatial patterns of settlement — the shift from rural to urban living.
The process by which an increasing proportion of a population comes to live in urban areas (towns and cities). It is driven by rural-to-urban migration — people moving in search of work, education and services — and by natural increase within cities.
For most of human history the great majority of people lived rurally. Industrialisation from the 18th century drew people into cities as centres of jobs, education and exchange, and the shift accelerated sharply through the 20th and 21st centuries. Urbanisation reshapes economies, transport networks and rural demographics far beyond the city edge.
Humanity passed the 50% urban mark around 2007–2008 — for the first time, more people lived in cities than in the countryside. The UN projects that about 68% of the world's people will live in urban areas by 2050 (UN DESA, World Urbanization Prospects), with almost all of the increase concentrated in Asia and Africa.
The most extreme form of the settlement pattern.
An urban area (city plus its continuous built-up agglomeration) with a population of more than 10 million people. Mega-cities are often major nodes in the global economy.
Mega-cities concentrate people, capital, infrastructure and influence at an enormous scale. There are now more than 30 mega-cities worldwide (UN), and the number keeps rising as urban populations grow — most rapidly in Asia and Africa.
The Greater Tokyo area is the world's most populous urban agglomeration, at roughly 37 million people (UN). It shows both the strengths of mega-cities — dense, highly productive, superb public transport — and their pressures: extreme land values, exposure to natural hazards, and the challenge of servicing tens of millions.
Other mega-cities include Delhi and Shanghai, each well above the 10-million threshold and still growing.
Be precise with the definition: a mega-city is > 10 million people. Don't confuse it with a "primate city" (a country's dominant city) or a "megalopolis" (several cities merged into one urban region).
Where cities are — and why they cluster.
Cities are unevenly distributed. Their locations reflect historical, environmental and economic advantages. Settlements have long clustered where water, fertile land, flat building sites, trade routes and safe harbours come together — along coasts, major rivers and route junctions.
Today the fastest urban growth is in Asia and Africa, while wealthy regions are already highly urbanised. The pattern is dynamic — it is reshaped by migration, technology and, increasingly, climate change.
Small in area, huge in impact.
Cities cover only about 3% of the Earth's land surface yet, according to UN estimates, they account for the majority of global energy use and around 70% of energy-related carbon emissions. They concentrate resource consumption, waste and pollution — but that same density also makes efficiency and sustainable design possible.
Planning and building cities that meet present needs without compromising future generations — balancing economic, social and environmental goals through green infrastructure, efficient transport, renewable energy and conservation.
Strategies to shrink the footprint include green infrastructure (parks, green roofs, urban trees), public and active transport, renewable energy, denser mixed-use development, and better waste and water management.
From nomadic camps to the modern mega-city.
Settlement is the story of human activity fixing itself to place. For most of prehistory, people were nomadic hunter-gatherers. The agricultural (Neolithic) revolution — the domestication of plants and animals — allowed people to settle permanently, producing food surpluses that could support larger, non-farming populations. That surplus is what made cities possible.
From the first cities, settlements grew more complex — developing division of labour, trade, writing, law and government. The Industrial Revolution triggered a second great leap, pulling millions into rapidly growing factory cities. The modern mega-city is the latest stage of the same long process.
Why marketplaces became cities.
Trade has been a powerful engine of urban growth. Where goods, people and ideas meet, marketplaces form; successful markets attract more people and services, and the settlement grows. Cities that sat on major trade routes, river crossings and harbours — from Silk Road caravan cities to medieval market towns and colonial ports — often expanded fastest and became the most influential.
Trade shapes not only a city's size but its spatial organisation — ports, warehouse districts, financial centres and transport corridors. Today's global cities remain deeply shaped by international commerce: containerised shipping, finance and digital trade drive their growth and form.
Trade links to the concept of interconnection: a city rarely grows in isolation. Naming the flows (goods, money, people, information) that feed a city is a strong way to explain why it grew where it did.
Where the first cities appeared.
The first cities emerged several thousand years ago in fertile river valleys where farming produced reliable surpluses — most famously in Mesopotamia (the "land between the rivers", the Tigris and Euphrates, in modern Iraq).
Uruk, in southern Mesopotamia (Sumer), was one of the earliest and largest cities of the ancient world, flourishing from around the 4th millennium BCE. Fed by irrigated farming on the river plains, it supported a large population, monumental architecture and an organised society — an early demonstration of how surplus food, trade and administration let settlements scale up into cities.
Exact dates and populations for the earliest cities are debated and uncertain. Treat Uruk as an illustrative early example of urban origins rather than quoting precise figures.
You should be able to: define urbanisation and describe the global rise of the urban population (UN ~68% by 2050); define a mega-city (>10 million) and give examples; describe and explain the uneven spatial distribution of cities; evaluate the environmental footprint of cities and strategies to reduce it; and outline the evolution of settlements — from Neolithic villages through ancient cities like Uruk to today's mega-cities — and the role of trade. Test yourself with the activity sheet and the topic study guide.
Everything in this chapter traces to a source you can check. Watch the explainer, read the primary sources, follow the news, and practise the geographical skills this chapter uses.