If you ever make your way to Colombia, try and time it just right so that you see Cano Cristales in all its glory. Often called “the most beautiful river in the world” as well as “the river of five colors,” Cano Cristales is one of those destinations you almost have to see to believe. Due to its remote location, it can only be accessed by horse, which makes seeing this river even more special.
During a brief span between the wet and dry seasons, when the water level is just right, the many varieties of algae and moss bloom in a dazzling display of colors; blotches of amarillo, blue, green, black, and red–and a thousand shades in between.

Via Atlas Obscura