The River Of Five Colors (36 photos..click 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,” “the liquid rainbow” or even “the most beautiful river in the world” due to its vibrant colors like yellow, green, blue, black, and especially the red of the Macarenia clavigera at the bottom of the river which gives it its unique appearance.

http://thechive.com/take-a-trip-to-cano-cristales-aka-the-river-of-five-colors