By Mario Carvajal – Own work, CC BY 3.0, Link
Caño Cristales is a Colombian river located in the Serrania de la Macarena province of Meta. The river is commonly called the River of Five Colors or the Liquid Rainbow, and is even referred to as the most beautiful river in the world due to its striking colors. The bed of river in the end of July through November is variously colored yellow, green, blue, black, and especially red, the last caused by the Macarenia clavigera (Podostemaceae) on the bottom of the river.
By Astromario – Own work, CC BY-SA 3.0, Link
By Mario Carvajal – Own work, CC BY 3.0, Link
By Peter Fitzgerald, CC BY 3.0, Link
By Mario Carvajal – Own work, CC BY 3.0, Link
e MORFES 
wow, stunning.. never have seen that before. Excellent captures!
Amazing river and so clear!
It is indeed beautiful !
Incredible.
Immagini straordinariamente belle, molto apprezzate.
Buona serata e un sorriso, silvia
beautiful place!