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. Buenos Aires is considered an Alpha World City listed by the Loughborough University group's (GaWC) 2008 inventory. After the internal conflicts of the 19th century, Buenos Aires was federalised and removed from Buenos Aires Province in 1880. The city limits were enlarged to include the former towns of Belgrano and Flores, which are both now neighbourhoods of the city.

Source: Wikipedia