Come to Cano Cristales at the right time and you'll learn why it's called the most beautiful river in the world. Throughout most of the year the bottom of the river is covered by the green moss. But only once a year, in September or November, this river explodes a variety of colors! Unique plants that cover the bottom of the river called Macarenia clavigera and only at certain time of the year they turn bright red. In combination with yellow sand and blue water everyone can see such an picturesque scene!