Caño Cristales, The River Of Five Colors, Serrania De La Macarena, Meta, Colombia

This only happens for a brief period in between seasons. During Colombia's wet season, the water flows too fast and deep, obscuring the bottom of the river and cutting off sunlight that turns the Macarenia clavigera red. During the dry season there is not enough water to support the dazzling array of life in the river. But for a few weeks from September through November, the river transforms into a veritable living rainbow.
Caño Cristales is located in a remote, isolated area not easily accessible by road. Adventurous tourists can now fly into the nearby town of La Macarena. From there it is a short trip into "Serrania de la Macarena," the national park in which Caño Cristales is located.
It is a succession of rapids, waterfalls, correones and pocetas whose waters flow from the plateau south of the Serranía de la Macarena, where this birth, behind the oldest tepuis of the Sierra in a rugged area in which numerous rock paintings are still unexplored.
The site was effectively closed to tourists for several years because of guerrilla activity in the region along with concerns about the impact of unregulated tourist traffic. It was reopened to visitors in 2009, and today there are several Colombian Tourist Agencies that will fly travelers to La Macarena. From there, they must make their way to the river site on horseback (or donkeyback) and by foot as part of a guided tour. Visitors are not permitted to stay overnight or cook.