Buenos Aires is the capital and largest city of Argentina. It 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 is one of the most populous cities in Latin America, with a population of over 3 million people. The city is known for its European-style architecture, vibrant nightlife, and rich cultural life. It is also home to many important historical sites, such as the Casa Rosada, the Obelisco, and the Teatro Colón.