The Parana river
in a river
La Plata River.
Buenos Aires is located on the southern shore of the Río de la Plata.
Amazon River
There are a total of 28 rivers that run through Paraguay. They are all a part of the La Plata Basin. They include Monday River, Confuso River, Paraguay River, and Monte Lindo River.
Río de la Plata -
The estuary "Río de la Plata" (River Plate)
Rio de Plata
Rio de La Plata
The Rio de la Plata.
Guaycuru
Yes, it's an estuary but only connects Uruguay with Argentina. The one that goes to the north from the "de la Plata" River is the Uruguay River.