Rio de Janeiro ( /ˈriːoʊ deɪ ʒəˈnɛəroʊ/ or /ˈriːoʊ deɪ dʒəˈnɛəroʊ/; Brazilian Portuguese: [ˈʁi.u dʒi ʒaˈnejɾu], River of January), commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th largest in the Americas, and 26th in the world. Rio de Janeiro has become a home of a World Heritage Site named "Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea," as granted by UNESCO on 1 July 2012 in the category Cultural Landscape. The decision was taken by the committee of the assets of the organization. The announcement came during a meeting in St. Petersburg, Russia.
The city was the capital of Brazil for nearly two centuries, from 1763 to 1815 during the Portuguese colonial era, 1815 to 1821 as the capital of the United Kingdom of Portugal, Brazil and Algarves, and 1822 to 1960 as an independent nation. Rio is nicknamed the Cidade Maravilhosa or "Marvelous City."