Caño Cristales, Serranía de la Macarena

Caño Cristales is a Colombian river located in the Serrania de la Macarena province of Meta, and is a tributary of the Guayabero River. It was found in 1969, by a group of cattle farmers. The river is commonly called the "River of Five Colors" or the "Liquid Rainbow," and is noted for its striking colors. The bed of the river from the end of July through November is variously colored yellow, green, blue, black, and especially red, the last caused by Macarenia clavigera plants on the riverbed. ()