Buenos Aires is one of the twenty-four federal states and capital of the Argentine Republic. It is situated in the central region of the country, on the western side of the Rio de la Plata, on the pampas plains.
The final results of the 2010 census estimated the city population at 2,890,151 inhabitants, being the largest urban area in the country, the second largest in South America, Hispanic America, and the southern hemisphere, and one of the twenty major cities in the world.
Together with São Paulo and Mexico City, it is one of the three Latin American alpha cities, according to the GaWC study.
Buenos Aires is among the cities with best quality of life in Latin America, and its per capita income is among the three highest in the region. It is the most visited city in South America.
Its urban profile is markedly eclectic. It is a medley—due to immigration—of art deco, art nouveau, neogothic, and French Bourbon styles, for which it is known worldwide as the Paris of America.
Skyscrapers are common on the skyline of the urban port. It was chosen by UNESCO as City of Design in 20015 and World Book Capital in 2011. It has also been chosen to host the Youth Olympics of 2018.