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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 striking colors like yellow, green, blue, black, and especially the red of the Macarenia clavigera (Podostemaceae) at the bottom of the river giving it a unique appearance.