In Colombia, there is a river whose length is about 100 km. It is located in the Sierra de la-Macarena.
Name it "River of five colors" and it viidimo most beautiful river in the world.
Great time of year - the river is no different from the rest.
But, nevertheless, each year period for which the river becomes a rainbow.
Red, yellow, green and blue algae really do like a river by hydrogen.
Very beautiful and unusual.