A favela in central São Paulo
São Paulo is a city in south east Brazil.
As migrants move into the city from rural areas they will move first to the informal favela areas where they build shelter and makeshift homes for themselves.
Most of these favelas are located on wasteland, marshy land, or land that is likely to flood.
They can also be found on very steep slope where it would be impossible to build any other sort of building.
Favelas are often found on or near rubbish tips or along major transport links like railways and major roads.
In São Paulo, most of the major favelas are now located at the edge of the city.
One example is Heliopolis in the south west of the city or Paraispolis (Paradise City) to the south.