When Two Amazonian Rivers Meet

The result is a blend as natural as oil and water. If you know the name of these two rivers that meet in Brazil, call it out I'm the comments section! 

Instagram post by Really.Makes.You.Wander 

"At the place where they meet, the rivers don’t mix. They leave a fairly clear boundary and flow side by side without mixing for about six kilometres. That happens because of the big difference in their flow speed, density and temperature."  (AweSci)