Buenos Aires formally Buenos Aires (CABA for short), also called Capital Federal for hosting the federalnota government - is one of the twenty-four federal agencies and the capital of Argentina. It is located in the central-eastern region, on the western shore of the Río de la Plata, in full pampas. The final results of the 2010 census estimate the city's population at 2, 890, 151 inhabitants, and its urban agglomeration, Greater Buenos Aires, in 12, 801, 364 inhabitants; being the largest urban area in the country, the second in South America, Latin America and the southern hemisphere and one of the 20 largest cities in the world. It is, along with São Paulo and Mexico City, one of three Latin American cities alpha category, according to the GaWC study. The city of Buenos Aires is among the cities with the highest quality of life in Latin America, and its per capita income is among the three highest in the región.8Es the most visited city in South America.