Fisherman Alvaro Diaz, 40, takes tourists hippopotamus watching by canoe on the Magdalena, the longest river in Colombia. When he notices the hippos are bothered, he keeps his group at least 30 ...

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

and Colombia. The Amazon River is also a habitat for a plethora of flora and fauna. 3. Yangtze River Yangtze River is the third-longest in the world and Asia’s longest with a length of 6,300 ...