The famous river that runs through Buenos Aires is the Rio de la Plata. This estuary is formed by the confluence of the Paraná and Uruguay rivers and is the widest river in the world. The Rio de la Plata has significant historical, economic, and cultural importance for Argentina and Uruguay. It serves as a vital shipping route, facilitating trade and transportation. The river's banks are also lined with vibrant neighborhoods, parks, and attractions, contributing to the cultural landscape of Buenos Aires.