World Geography
Continents, oceans, mountain ranges, rivers, deserts, and the systems we use to navigate the planet.
The 7 Continents
| Continent | Area (km²) | Population | Countries | Largest Country |
|---|---|---|---|---|
| Asia | 44.6 million | 4.7 billion | 48 | Russia (partly) |
| Africa | 30.4 million | 1.4 billion | 54 | Algeria |
| North America | 24.7 million | 600 million | 23 | Canada |
| South America | 17.8 million | 435 million | 12 | Brazil |
| Antarctica | 14 million | ~5,000 (researchers) | 0 | N/A |
| Europe | 10.5 million | 745 million | 44 | Russia (partly) |
| Australia/Oceania | 8.5 million | 44 million | 14 | Australia |
The 5 Oceans
| Ocean | Area (km²) | Key Facts |
|---|---|---|
| Pacific | 165 million | Largest ocean; covers more area than all land combined; deepest point: Mariana Trench (11,034 m) |
| Atlantic | 106 million | Second largest; separates the Americas from Europe and Africa; busiest shipping lanes |
| Indian | 70 million | Third largest; warmest ocean; bordered by Africa, Asia, and Australia |
| Southern | 21 million | Surrounds Antarctica; officially recognized by National Geographic in 2021 |
| Arctic | 14 million | Smallest and shallowest; mostly covered by sea ice; surrounding the North Pole |
Major Mountain Ranges
| Range | Location | Highest Peak | Elevation |
|---|---|---|---|
| Himalayas | Asia (Nepal/China/India) | Mount Everest | 8,849 m |
| Andes | South America (west coast) | Aconcagua | 6,961 m |
| Rocky Mountains | North America (western US/Canada) | Mount Elbert | 4,399 m |
| Alps | Europe (Switzerland/France/Italy) | Mont Blanc | 4,808 m |
| Appalachians | Eastern North America | Mount Mitchell | 2,037 m |
| Ural Mountains | Russia (Europe-Asia border) | Mount Narodnaya | 1,895 m |
Major Rivers
| River | Length (km) | Continent | Empties Into |
|---|---|---|---|
| Nile | 6,650 | Africa | Mediterranean Sea |
| Amazon | 6,400 | South America | Atlantic Ocean |
| Yangtze | 6,300 | Asia | East China Sea |
| Mississippi-Missouri | 6,275 | North America | Gulf of Mexico |
| Yenisei | 5,539 | Asia | Arctic Ocean |
| Congo | 4,700 | Africa | Atlantic Ocean |
Nile vs Amazon
The Nile is the longest river by length. The Amazon carries by far the most water — about 20% of all fresh water that flows into the world's oceans. By water volume, the Amazon is the world's largest river.
Major Deserts
| Desert | Location | Area (km²) | Type |
|---|---|---|---|
| Antarctic Desert | Antarctica | 14.2 million | Cold (polar) |
| Arctic Desert | Arctic | 13.9 million | Cold (polar) |
| Sahara | North Africa | 9.2 million | Hot |
| Arabian Desert | Middle East | 2.3 million | Hot |
| Gobi | China/Mongolia | 1.3 million | Cold (continental) |
| Atacama | South America (Chile) | 181,000 | Coastal cold |
What Is a Desert?
A desert is any region that receives less than 250 mm of precipitation per year. That includes polar regions covered in ice — Antarctica is technically the world's largest desert.
Latitude and Longitude
Latitude and longitude are a coordinate system used to locate any point on Earth's surface.
Latitude
Runs east-west (horizontal lines). Measures how far north or south of the equator a point is. Ranges from 0° at the equator to 90° at the poles. Also called "parallels."
Longitude
Runs north-south (vertical lines). Measures how far east or west of the Prime Meridian (0°, through Greenwich, England) a point is. Ranges from 0° to 180°. Also called "meridians."
Key Lines of Latitude
90°N —— North Pole
66.5°N — Arctic Circle
23.5°N — Tropic of Cancer
0° —— Equator
23.5°S — Tropic of Capricorn
66.5°S — Antarctic Circle
90°S —— South Pole
The tropics (between 23.5°N and 23.5°S) receive the most direct sunlight and are generally the warmest regions on Earth.
Key Geographic Terms
| Term | Definition | Example |
|---|---|---|
| Isthmus | A narrow strip of land connecting two larger land masses | Isthmus of Panama |
| Peninsula | Land surrounded by water on three sides | Florida, Italian Peninsula |
| Strait | A narrow body of water connecting two larger bodies of water | Strait of Gibraltar |
| Delta | A triangular landform at a river's mouth where it meets the sea | Nile Delta, Mississippi Delta |
| Archipelago | A group or chain of islands | Hawaii, Indonesia |
| Plateau | A flat, elevated area of land | Tibetan Plateau, Colorado Plateau |
Country vs Nation vs State vs Territory
- Country — a region with defined borders and a government. Often used interchangeably with "nation."
- Nation — a group of people who share culture, history, and often language. A nation may or may not have its own country (e.g., the Kurdish people).
- State — can mean a country (in international law) or a political subdivision within a country (like US states or German states).
- Territory — a region controlled by a country but not fully self-governing. Examples: Puerto Rico (US), Greenland (Denmark).
Frequently Asked Questions
How many countries are there in the world?
There are 195 countries recognized internationally — 193 are UN member states, plus Vatican City and Palestine which have observer status. The exact number can vary depending on how "country" is defined, since some territories have disputed status.
What is the largest country in the world?
Russia, at about 17.1 million km². It spans 11 time zones and covers more than twice the area of the second-largest country, Canada (9.98 million km²). The United States is third at 9.83 million km².
Which continent has the most countries?
Africa, with 54 recognized countries. It is also the second largest continent by area and the second most populous. Nigeria is Africa's most populous country with over 220 million people.
What is the difference between climate and weather?
Weather is the short-term atmospheric conditions in a specific place — temperature, rain, wind today or this week. Climate is the long-term average of weather patterns in a region over 30 or more years. Weather changes daily; climate changes over decades.
Quick Quiz
Check your understanding. Click an answer to see if you got it right.