Uruguay River is the second-longest river in South America, with its source in the Serra do Mar mountain range in Brazil. The river then winds through Uruguay for over 1,000 kilometers before emptying into the Rio de la Plata estuary. This majestic river has several synonyms, including 'Rio Uruguay,' 'River of the Birds,' and 'River of the Painted Birds.' The river's calm waters and beautiful scenery have made it a popular destination for tourists and locals alike. The Uruguay River is a major source of freshwater, and its basin is also an important agricultural region. Its synonyms reflect the natural beauty and significance of this remarkable waterway.