Most of Argentina’s rivers empty into the Atlantic Ocean. Three rivers—the Paraná, Paraguay, and Uruguay—flow generally southward and form a major South American river system. The Paraguay joins the Paraná north of the city of Corrientes in Argentina. The Paraná then continues south and east until it joins the Uruguay River near Buenos Aires to form the huge Río de la Plata. This estuary, which carries the rivers to the Atlantic Ocean, forms part of the border between Argentina and Uruguay. The Paraná-Uruguay system is navigable for about 3,000 km (about 2,000 mi). A famed scenic attraction, the Iguaçu Falls, is on the Iguaçu River, a tributary of the Paraná.
Other important rivers of Argentina are the Río Colorado, which forms the northern boundary of Patagonia; the Río Salado in the Chaco of northern Argentina; and the Río Negro in Patagonia. In the area between the Río Salado and the Río Colorado and in the Chaco region, some large rivers empty into swamps and marshes or disappear into sinkholes.
In the south, the Argentine lake district extends from the Andes to the Patagonian plateaus. This popular resort area is noted for its many lakes and thick evergreen forests, which lie against a backdrop of snowcapped mountains and glaciers. One of the largest lakes is Nahuel Huapí, in northern Patagonia. The lake and the surrounding area make up the Nahuel Huapí National Park.
Other lakes in the area are Lake Buenos Aires, which lies on the border between Argentina and Chile, and lakes Viedma and Argentino, which are fed by alpine glaciers. The lake district draws visitors for summer holidays and for winter sports. "Argentina" © Emmanuel BUCHOT, Encarta, Wikipedia
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