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Buenos Aires is the capital and largest city of Argentina, currently the second-largest metropolitan area in South America, after São Paulo. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the South American continent. The city of Buenos Aires is not part of Buenos Aires Province, nor is it its capital; rather, it is an autonomous federal district. Greater Buenos Aires is the third-largest conurbation in Latin America, with a population of around 13 million.