What Is North America?
North America is the world's third-largest continent by area, covering approximately 24.7 million km². It extends from the Arctic Ocean in the north to the narrow land bridge connecting it to South America in the south.
Key facts:
- Number of countries: 23 (including the Caribbean island nations)
- Largest country (by area): Canada — the world's second-largest country overall
- Most populous country: United States of America (USA) — over 330 million people
- Highest mountain: Denali (6,190 m) in Alaska, USA — the highest peak in North America
- Lowest point: Death Valley, California, USA (−86 m below sea level)
- Total population: approximately 600 million
North America includes three large mainland countries (Canada, the USA, and Mexico), the countries of Central America, and many island nations of the Caribbean Sea.
Major Landforms
North America's landscape can be divided into several distinct regions running roughly north to south:
- Rocky Mountains: A massive mountain range running about 4,800 km from Alaska and Canada southward through the western USA into Mexico. They were formed by the collision of tectonic plates and include peaks over 4,000 m.
- Great Plains: A vast flat grassland in the centre of North America (covering parts of Canada and the USA), formed from sediments deposited by ancient seas and rivers. This region is one of the world's great grain-growing areas.
- Appalachian Mountains: Older and lower than the Rockies, running along the eastern side of North America. They were once as high as the Himalayas but have been worn down over hundreds of millions of years.
- Grand Canyon: One of the world's most spectacular natural landmarks. The Colorado River has carved a gorge up to 1,800 m deep and 446 km long through layered rocks in Arizona, USA, exposing nearly 2 billion years of Earth's history.
Death Valley in California is not only the lowest point in North America at 86 metres below sea level — it also holds the record for the highest reliably recorded air temperature on Earth: 56.7°C (134°F), recorded on 10 July 1913. It is one of the hottest and driest places on the planet.
Rivers and the Great Lakes
North America has some of the world's most important river systems and the largest collection of freshwater lakes on Earth.
- Mississippi River (3,730 km): One of the longest rivers in the world, flowing southward through the centre of the USA and draining into the Gulf of Mexico. Its basin drains about 40% of the continental USA. Together with the Missouri River (its longest tributary), the combined length exceeds 6,000 km.
- Missouri River (3,767 km): The longest river in North America, and a major tributary of the Mississippi.
- Colorado River: Flows through the Grand Canyon and into the Gulf of California. Its water is used so heavily for farming and cities that it often reaches the sea as only a trickle.
- Yukon River (3,185 km): Flows through Canada and Alaska.
The Great Lakes — Superior, Michigan, Huron, Erie, and Ontario — form the world's largest group of freshwater lakes. Together they contain about 21% of the world's surface fresh water and form a natural border between the USA and Canada. Niagara Falls, one of the world's most famous waterfalls, is where Lake Erie drains into Lake Ontario.
Climate Zones
Because North America stretches from the Arctic to the tropics, it has an extraordinary range of climates:
- Arctic / Subarctic: Northern Canada and Alaska — bitterly cold winters, permafrost (permanently frozen ground).
- Temperate continental: Most of Canada and the northern USA — cold winters, warm summers, moderate rainfall.
- Mediterranean: The coast of California — dry summers, wet mild winters.
- Desert: The American Southwest (Nevada, Arizona) and northern Mexico — very hot and dry.
- Humid subtropical: The southeastern USA — hot, humid summers and mild winters.
- Tropical: Central America and the Caribbean — hot and wet all year, or with distinct wet and dry seasons.
- Tornado Alley: A broad region of the central USA where warm moist air from the Gulf of Mexico meets cold dry air from Canada, creating some of the world's most violent tornadoes.
The Great Plains of North America were once covered by enormous herds of American bison (buffalo) — an estimated 30–60 million animals. By the 1880s, unregulated hunting had reduced the population to fewer than 1,000. Conservation efforts have since brought numbers back to several hundred thousand, but the great herds are gone. Today the Great Plains are called the "breadbasket of the world" for the vast quantities of wheat, corn, and soy grown there.
Real world: Tornado Alley — where geography creates the world's most violent storms
Nowhere on Earth produces more tornadoes than the central United States. The reason is purely geographic: warm, moist air flows northward from the Gulf of Mexico and collides with cold, dry air descending from Canada over the flat Great Plains — there are no mountain barriers to stop this clash. The result is enormous thunderstorm systems called supercells that can spin off tornadoes with winds exceeding 400 km/h. The USA records around 1,200 tornadoes per year, more than the rest of the world combined. Communities in Kansas, Oklahoma, and Texas build storm shelters, schools run tornado drills, and the NOAA Storm Prediction Centre issues daily tornado watches. North America's flat interior geography is the direct cause of this extreme weather hazard.
Real world: The Colorado River — over-allocated and under pressure
The Colorado River carved the Grand Canyon over millions of years and today supplies water to 40 million people across seven US states and Mexico — including Las Vegas, Phoenix, Los Angeles, and San Diego. Demand has grown so much that the river rarely reaches the sea anymore: the last 150 km of its channel in Mexico is often bone dry. Since the 1990s, water rights disputes between states, farmers, and cities have intensified. In 2021, the US government declared the first-ever water shortage emergency on the Colorado, triggering mandatory cuts to water deliveries. The Colorado is a vivid example of how human geography (population growth, urbanisation, agriculture) can overwhelm the limits set by physical geography (the river's natural flow).
Real world: The Great Lakes and industrial geography
The five Great Lakes were formed when glaciers retreated at the end of the last Ice Age, carving deep basins in the bedrock. Their combination of freshwater, flat land, and easy water transport made the surrounding region — sometimes called the "Rust Belt" — the engine of American industrial growth. Detroit built cars, Pittsburgh made steel, Chicago became a grain hub. Today the lakes still supply drinking water to 40 million people. The lakes also highlight environmental vulnerability: runoff from farms and cities has caused severe algae blooms, and invasive species like zebra mussels (introduced from European ships' ballast water in the 1980s) have permanently altered ecosystems. The Great Lakes demonstrate how physical geography shapes economic development — and how economic activity reshapes geography in return.
North America's geography connects directly to everyday life worldwide. Much of the wheat in your bread, the corn in processed food, and the soy in animal feed comes from North America's Great Plains. Canada supplies large proportions of the world's potash (fertiliser), timber, and oil. The Mississippi River system remains one of the most important freight waterways on Earth, carrying grain barges 3,000 km from the Midwest to the Gulf of Mexico. Understanding North America's geography is understanding a large part of the modern food and energy system.
Countries and People
North America's three largest countries dominate the continent:
| Country | Key Feature |
|---|---|
| Canada | World's 2nd largest country; bilingual (English and French) |
| United States | Most powerful economy in the world |
| Mexico | Over 130 million people; ancient Aztec civilisation |
Central American countries including Guatemala, Honduras, Costa Rica, and Panama form a narrow land bridge connecting North and South America. The Caribbean includes island nations such as Cuba, Jamaica, Haiti, the Dominican Republic, and Barbados.
Practice Problems
Name the five Great Lakes and explain why they are geographically significant.
Show answer
Explain why North America has such a wide variety of climate zones.