About Mexico City: Mexico City, the capital of Mexico, is the seventh most populated city on Earth with about 23 million people. It was built where the great Aztec city of Tenochtitlan once stood on an island in a lake. Because it sits on a drained lake bed, parts of the city slowly sink each year. Built on a drained lake, it slowly sinks a little each year

Location: In a high valley in central Mexico · Country: Mexico · Population: About 23 million people live in its urban area · Continent: North America · Landmark: Built where the Aztec city of Tenochtitlan once stood · Famous For: Its history, huge squares and ancient ruins · World Rank: The seventh most populated city in the world