For most of the year, the Caño Cristales is
indistinguishable from any other river, with a
bed of rocks covered in dull green mosses and
a cool dark blue current. However for a short period each year the river
blossoms in a rainbow of colors.During Colombia's wet season, the water flows
fast and deep, obscuring the bottom of the river
and denying the mosses and algae that call
the river home the sun that they need.