Caño Cristales (in English: Crystal Channel) 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. The bed of river in the end of July through November is variously colored yellow, green, blue, black, and especially red, the last caused by the Macarenia clavigera (Podostemaceae) on the bottom of the river.
Read more: https://en.wikipedia.org/wiki/Ca%C3%B1o_Cristales Website: http://www.cano-cristales.com/en/cano-cristales-rio-los-cinco-colores/
China also has a colored lake:
THE FIVE FLOWER LAKE, JIUZHAIGOU VALLEY, CHINA
Located in the Jiuzhaigou Valley, a national park and reserve in Sichuan, the Five Flower Lake is the product of glacial runoff, with the blue, green, and turquoise waters drawing their color from differing calcium carbonate concentrations and varying depths. Due to the shallowness and clear waters of the Five Flower Lake, preserved ancient trees that litter the lakebed are visible from the surface.