Claim: Rio de Janeiro is a metropolis.
Evidence: The metropolis is anchor to the Rio de Janeiro metropolitan area , the second-most populous metropolitan area in Brazil and sixth-most populous in the Americas.
Greater Rio de Janeiro , officially Rio de Janeiro Metropolitan Region -LRB- Grande Rio , officially Região Metropolitana do Rio de Janeiro , in Portuguese -RRB- is a large metropolitan area located in Rio de Janeiro state in Brazil , the second largest in Brazil and third largest in South America.
The metropolitan area of Rio de Janeiro is known as a historical , cultural and economic centre of Brazil , with a total population of 12.6 million inhabitants.