The longest rivers in the world stretch over thousands of kilometres. From the Amazon to the Nile, they are crucial to human ...

It is one of the world’s most significant waterways, stretching across Peru, Colombia and Brazil. It is home to the world’s largest species of river dolphin and some 60 species of piranha.

We've picked some of the world's greatest rivers to profile -- the longest, deepest, widest or simply the most beautiful. Whether you're after pristine isolation, lush wilderness, exotic animals ...