Compared to every other one of the world’s great rivers, the Amazon is by far the biggest. However it’s measured, by the amount of water, size of its drainage basin, or total length, no other river comes close.
Yes, some argue the Nile River is a bit longer in total length, but that fact too is in dispute. The Amazon River, with an average discharge of 55-million gallons per second, releases more water than the next seven-largest rivers in the world combined. The Amazon River discharges approximately 20 percent of the world’s total fresh water. The Amazon basin, at more than 2.7 million square miles, is nearly twice the size of the world’s second largest river (by water discharged), Africa’s Congo River basin. And the Amazon’s mouth stretches over 40 miles and pushes freshwater more over 100 miles into the Atlantic Ocean. To date, no bridge has been built across any portion of the Amazon River.