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Buenos Aires is the capital and most populous city of Argentina. The city is located on the western shore of the estuary of the Río de la Plata, on the South American continent's southeastern coast. Buenos aires can be translated as fair winds or good airs, but the first one was the meaning intended by the founders in the 16th century, by the use of the original name Real de Nuestra Señora Santa María del Buen Ayre. The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the fourth-most populous metropolitan area in the Americas, with a population of around 17 million.