The secret of the Earth’s largest river: what is it hiding?

The Amazon River has the largest water volume on Earth and is perhaps the most mysterious river of all. In this documentary episode, we explore fascinating facts about the Amazon River and the Amazon region: why there are no bridges spanning the river, how its waters can appear to flow in reverse, where a "boiling" river can be found, and what scientists have discovered beneath the jungle canopy using LiDAR technology.

You will learn why the ocean water at the river's mouth remains fresh, how people live in cities that are virtually inaccessible by car, which creatures in the water are truly dangerous, why Amazon dolphins are pink, and why calling the Amazon the "lungs of the planet" is actually a misconception. We also cover the Hamza—an underground river—as well as "flying rivers" in the sky above the forest, the arrival of dust from the Sahara, and the individuals who have trekked the entire length of the Amazon or swum thousands of kilometers along its course.