The Amazon is well known for a number of reasons. It is the greatest river of South America and the largest drainage system in the world in terms of the volume of its flow and the area of its basin.

The Amazon is considered one of the world's greatest rivers primarily because of its staggering volume of water, which is greater than the next seven largest rivers combined. It accounts for approximately 20% of all the freshwater that enters the world's oceans, discharging an average of 219,000 cubic meters per second. Beyond its discharge, it is the lifeblood of the Amazon Rainforest, the most biodiverse ecosystem on Earth, supporting over 3,000 known species of fish and an estimated one-third of all global species along its banks. Geographically, it is a massive system with over 1,100 tributaries, many of which are significant rivers in their own right. During the wet season, the river can expand to over 30 miles wide, earning it the nickname "The River Sea." Its sheer scale, influence on global climate patterns, and role as a critical habitat for unique creatures like the pink river dolphin make it an unparalleled geographical marvel that is essential to the planet's ecological health.