The largest river in the world by volume is the Amazon River. Flowing through South America, primarily in Brazil, it carries the largest volume of water of any river, with an average discharge that far exceeds that of any other river globally. The Amazon River Basin is also one of the most biodiverse regions, housing a vast array of wildlife and plant species. The river extends over 4,000 miles and has numerous tributaries, playing an essential role in the ecology and climate of the region. Its size and flow have major impacts on global weather patterns and aquatic ecosystems.