What is the longest river in South America?

The longest river in South America is the Amazon River. It stretches approximately 4,345 miles (7,062 kilometers) across Brazil and several other countries, including Peru and Colombia. The Amazon River is not only the longest in South America but also the largest river by discharge of water in the world. It flows through the Amazon Rainforest, which is home to an incredible diversity of wildlife. The river is vital for the local communities and ecosystems that rely on its waters for transportation, drinking, and agriculture.