There are so-called primitive cultures in the jungles of the Amazon and on the island of New Guinea, and there are so-called advanced cultures in Europe, Asia, and Africa, but the languages of these cultures are all equally advanced and complex.
The Amazon is the second longest river in the world after the Nile.
The Amazon is fed by a large number of tributaries.
I've ordered a book from Amazon.com.
He explored the Amazon jungle.
The Amazon River meanders through northern Brazil.