Río Negro

Río Negro ( Spanish pronunciation: [ˈri.o ˈneɣɾo]; Black River) is the main river of Patagonia in terms of the size of its drainage basin, its associated agricultural produce and population living at its shores. In eastern Patagonia it is also the largest by flow rate. The river flows through the Argentine province of Río Negro which is named after it. Its name comes from the literal translation of the Mapuche term Curu Leuvu, although the water is more green than black. Formerly, it was also known as "river of the willows" because of the big number of weeping willows that grow along the bank. It is 635 km in length.

It originates from the junction of the Limay River and Neuquén River at the border with the Neuquén Province, and flows southeast incised through steppes to the Atlantic Ocean at 41°01′20″S 62°47′25″W / 41.0223°S 62.7903°W / -41.0223; -62.7903, near El Cóndor beach resort some 30 km (19 mi) downstream from Viedma, Río Negro province's capital.