Buenos Aires, officially known as the Autonomous City of Buenos Aires, is the capital and largest city of Argentina. It is situated on the southwest bank of the Río de la Plata.
The city proper has a population of 3.1 million people, while its broader urban area houses approximately 16.7 million residents, making it the 21st most populous metropolitan area globally. According to the GaWC 2024 ranking, Buenos Aires is classified as an Alpha− global city.