The color of the water has nothing to do with his name, since they are light green. It was known by various names: Rio de los Sauces, Cusú Leufú, Curi Leuvú and Curú Leuvú (in Mapuche language Curú = river Leuvú = black). Darwin learned that the river was called Negro by cacique, but it would be Falkner, who, by repeating the translation of the Mapuche would release this river to the Spanish noun with which it is known today: Negro River.
It is the most important river in Patagonia for its flow and there is done, for example, the world's longest kayak competition. This river has a course of 653 kilometers and flows into the Atlantic ocean in an estuary obstructed by the deposition of sand transported to prevent the installation of a good harbor.
Its basin of about 125,500 km2, receives water from an area that begins at 36 º 21 'south latitude to the vicinity of Mount Tronador, leading the way similar to a fan base which gives rise to the Negro River.
Most of the way is through arid plateaus that cause a negative water balance in the middle of a valley, sometimes dilated to 20 km wide at the lower and 3 to 6 km in its early stages to claim the ancient periodic flooding.
Throughout the coastal area of Negro River from Cipolletti in the west, through General Roca and arriving Viedma in the east, there are places of great beauty for camping, water sports, fishing or recreation. Social clubs are located there that attract many people to this area of the city.
The landscape is complete with attractive bards, a geological formation composed of sedimentary rocks of different ages (Mesozoic, Cretaceous 120 million years and Cenozoic Tertiary period 55 million years later).
On the floor you can find sea shells, petrified wood and many other curiosities that make up this wonderful heritage.
The eagles, vultures and other birds often officiate as guardians features hovering gracefully over the land.
The flora is also very interesting, despite its desert aspect is very varied: jarilla, alpataco, coirón, jume, cat's claw, Zampa, colapiche, molle, matacebo cactus and many other dot the landscape.