There's an underground river 4 KM (2.4 mi) beneath the Amazon River in Brazil, that might be as long, but hundreds of times wider.
There are no bridges over the Amazon River.
The Amazon River once flowed in the opposite direction, from east to west.
The Amazon River discharges 5 times as much water as any other river on the planet.
Sand from the Sahara is blown by the wind all the way to the Amazon, recharging its minerals. The desert literally fertilizes the rainforest.
Iquitos, Peru is the largest city in the world inaccessible by road. It's located deep in the Amazon rainforest and has over 400,000 people.
In 2008, Norway donated US$1 billion to help save the Amazon rainforest.
Amazonian butterflies drink turtle tears.
20% of the Earth's oxygen is produced by the Amazon rainforest.