This rainbow river is unique and awesome at the same time. I've never see something like that but it appears that this is really difficult to access it and maybe that's a good news cause not a lot of people can also pollute this delicate ecosystem. This river named Caño Cristales is located in Colombia in the Serrania de la Macarena province of Meta. You can only see this type of color from the end of July to November. If you want to have more information on this river, just check the wikipedia page.