The Amazon rainforest is home to the largest river system on the planet: the Amazon River basin. This vast hydrological network comprises more than 1,100 individual rivers, with the Amazon River itself reigning as the largest by discharge volume and length. Together, these waterways drain an area of roughly 7 million square kilometers, sustaining unparalleled biodiversity and playing a critical role in global climate regulation. From major tributaries like the Madeira, Negro, and Xingu to countless smaller streams, each river contributes to the basin's immense freshwater output, which accounts for about 20% of the world's riverine discharge into the oceans.