Caño Cristales in English Crystal Spout; is a Colombian river located in the Serrania de la Macarena province of Meta. It's a tributary of the Guayabero River. 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. From September and November, Caño Cristales river in Colombia changes from ordinary clear water to a rainbow of colour. The stunning and surreal beauty of the Colombian river Caño Cristales is really wonderful.