[Colombia] During certain months of the year, Colombia’s Caño Cristales turns shades of red, blue, yellow, orange and green in a vibrant natural display that happens nowhere else on Earth.
Just east of the Andes, central Colombia’s Caño Cristales is a river like no other. Reaching 100km long and sometimes called the “Liquid Rainbow”, Caño Cristales runs during certain months of the year with shades of red, blue, yellow, orange and green in a vibrant natural display that happens nowhere else on Earth.

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.

Some people mistakenly think Caño Cristales’ colour comes from algae or moss. The real culprit, however, is a picky endemic aquatic plant which requires precise conditions, including just the right water level and just the right amount of sunlight, to take on its bright hues.

These red plants adhere tightly to rocks in places where the river has faster current.
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