The World's Ten Biggest Metropolitan Areas

6. Sao Paulo, Brazil
Metropolitan area: 19.6 million people
City: 11 million people

Sao Paulo, the sixth-largest metropolis in the world. It is Brazil’s richest city and the most important financial center in Latin America. Poverty and crime, however, remain a problem. An average of 6,000 people are murdered annually.

Urban Detail:
With more than 66 percent of its population under twenty years and many immigrants, Sao Paulo is a very young and ethnically diverse city. (Photo: Shutterstock)