Because many people are too poor to live in the better suburbs.
Rio.
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Rio de janeiro
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The famous Brazilian city that starts with 'Rio de', is Rio de Janiero.
Rio de Janiero is the name of the city. The Stadium there is the Maracana Stadium
Rio de janiero
January's River.
Rio de Janiero
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Niteroi Park
The best place to find Rio de Janiero would be on tourist sites. Also, speaking to a travel agent can be helpful if one is planning a vacation to that area.