The world's largest river by volume is the Amazon River. Flowing across South America, primarily through Brazil, it discharges more water than any other river system globally and has an extensive drainage basin that supports immense biodiversity. The Amazon River and its tributaries play a vital role in the Earth's climate and ecology, while the surrounding rainforest is often referred to as the "lungs of the planet" due to its significant contribution to oxygen production. The sheer volume of water flowing through the Amazon is a testament to its size and importance in both geographical and ecological contexts.