When the Amazon river flowed backwards #facts #marinemystery #prehistoric #wildlife #earthhistory

Added: 2026-05-19

[00:00:00]The Amazon River once flowed backwards.

[00:00:02]The world's largest river used to run the opposite way. Millions of years ago, South America looked completely different. The land tilted toward the Pacific Ocean. Rivers drained west instead of east. Huge wetlands covered much of the continent. Then the Andes mountains began to rise. They blocked the old path completely. Water had nowhere to go. But rivers don't stop flowing. They find a new direction. The pressure reversed the entire system and the Amazon began flowing toward the Atlantic.