How the Aztecs Built a City on a Lake Island
Tlazo the scribe kneels at the edge of Lake Texcoco, unrolling a bark-paper map that shows the island city of Tenochtitlan rising from the water, its stone causeways stretching to the shore and green chinampas floating alongside the city walls.
- Identify where the Aztec city of Tenochtitlan was located in present-day North America
- Describe why the Aztecs built their capital on an island in Lake Texcoco
- Explain what chinampas are and how they helped feed the island city
- Name two features — causeways and chinampas — that solved problems of living on water
Key terms
- Tenochtitlan
- The Aztec capital city built on an island in Lake Texcoco, in present-day Mexico
- causeway
- A raised stone road built across water to connect an island to the shore
- chinampa
- A rectangular Aztec garden bed of mud and reeds built in shallow lake water to grow crops
- Mesoamerica
- The region of southern North America where the Aztec, Maya, and other civilizations arose
Solving the Island Problem
Building on an island gave Tenochtitlan a natural water barrier against enemies, but it created two hard problems: how to travel to the mainland and how to grow food with no farmland. The Aztecs engineered clever answers, turning the very water that protected them into a surface they could cross and farm, which let the city flourish where most peoples could not have survived.
Farming on Water
Chinampas were the key to feeding a huge city. Farmers wove reed mats, piled rich lake-bottom mud on top, and anchored them with willow trees in the shallows. These fertile, well-watered plots produced several harvests of corn, beans, and squash each year. So much food let Tenochtitlan grow into one of the largest cities in the world at the time.
Worked examples
How did the Aztecs feed a city with no farmland?
- State the problem: the island capital had little dry ground for growing crops.
- Identify the resource: the surrounding lake was shallow and full of rich mud.
- Trace the invention: farmers built chinampas, mud garden beds anchored in the water.
- Reach the result: these fertile plots yielded many harvests, feeding a very large population.
Answer: They invented chinampas, fertile garden beds built in the lake, which produced enough crops to feed one of the world's largest cities.
Activity
Drag each Aztec invention to the problem it solved for the island city.
Practice
Explain how causeways and chinampas each solved a problem of island life.
Describe why building on an island gave the Aztecs a defensive advantage.
Common mistakes to avoid
- Tenochtitlan was located in South America.It stood in present-day Mexico, which is part of North America, not South America.
Check your understanding
In which continent was the Aztec city of Tenochtitlan located?
What was the main purpose of Aztec chinampas?
Why did the Aztecs choose to build their capital on an island in Lake Texcoco?
Recap
The Aztecs built Tenochtitlan on an island in Lake Texcoco for defense, then solved island life with stone causeways for travel and chinampas for farming, growing it into one of the world's largest cities.
Reflect
How do people today turn the challenges of where they live into clever solutions?