Title: Paraná River
Content:  The Paraná River (Río Paraná, Rio Paraná, Ysyry Parana) is a river in south Central South America, running through Brazil, Paraguay, and Argentina for some 4880 km. It is second in length only to the Amazon River among South American rivers. It merges with the Paraguay River and then farther downstream with the Uruguay River to form the Río de la Plata and empties into the Atlantic Ocean. The first European to go up the Paraná River was the Venetian explorer Sebastian Cabot, in 1526, while working for Spain. In 2021 a drought has hit the river causing a 77-year low.
Title: Paranoá River
Content:  The Paranoá River is a river in the Federal District, Brazil. It flows into São Bartolomeu River which then joins the larger Corumbá River.
Title: Paraná River (Maranhão)
Content:  The Paraná River is a river of Maranhão state in northeastern Brazil.
Title: Paranaíba River
Content:  The Paranaíba River is a Brazilian river whose source lies in the state of Minas Gerais in the Mata da Corda mountains, municipality of Rio Paranaíba, at an altitude of 1,148 meters; on the other face of this mountain chain are the sources of the Abaeté river, tributary of the São Francisco River. The length of the river is approximately 1000 km up to the junction with the Grande River, both of which then form the Paraná River, at the point that marks the borders of the states of São Paulo, Minas Gerais, and Mato Grosso do Sul.
Title: Paranaíta River
Content:  The Paranaíta River is a river of Mato Grosso state in western Brazil.
Title: Paranhana River
Content:  The Paranhana River is a river of Rio Grande do Sul state in southern Brazil.
Title: Paranaíba River
Content:  Meia Ponte river, which then flows into the Paranaíba. The Paranaíba river is the most important source of the Paraná river, her source lies in the serra (mountains) of Mata da Corda, municipality "Rio Paranaiba" (Mato Grosso) at a height of 1148 m. On the other side of these serra is the source of the Abaete, a tributary of the São Francisco. The confluence of the Paranaíba with the Grande river is situated about 1000 km from the source of the Paranaíba. At the unison there is a bridge that is also a border point between three states: São Paulo, Minas Gerais and Mato Grosso do Sul. The Paranaíba river is famous for the rich diamond deposits of her tributaries and her huge hydroelectric potential. The Paranaíba may best be studied in three separate parts, the high-, the middle- and the lower Paranaiba.
Title: Geography of Paraguay
Content:  course. The major tributaries entering the Paraguay River from the Paraneña region—such as the Apa, Aquidabán, and Tebicuary Rivers—descend rapidly from their sources in the Paraná Plateau to the lower lands. There they broaden and become sluggish as they meander westward. After heavy rains these rivers sometimes flood nearby lowlands. About 4700 km long, the Paraná River is the second major river in the country. From Salto del Guairá, where the former Guairá Falls were located, the river enters Paraguay and flows 800 km to its juncture with the Paraguay River and then continues southward to the Río de la Plata Estuary at Buenos Aires, Argentina. In general, the Río Paraná is navigable by large ships 
Title: Paranaíba River
Content:  NB: of each segment the start km-point (and counting down) beginning with 1,070, the length, the slope etc. will be mentioned. From its headwaters at 1,000 km, a length of 370 km, to km 700, runs with a northerly orientation through the whole extent of the region Minas Gerais at an average height of 760 m, with a slope of 25 cm/km, goes through the town Patos of Minas at a height of 770 m, obtains water from a number of small tributaries that descend from the Magalhães-peak and from the Serra of Barbaça, on the other side of the Serra da Mata da Corda. At a height of km 729, at a bridge, she receives the water of a small river, the Verde river, close to the place Contendas (Goias) and bends under the bridge perpendicularly to the southeast and takes the border between Minas and Goias. Between km 700 and 800 the slope is 50 cm/km, running in a valley of average width, with broken strictures between km 730 and 732 and between km 783 and 790. The terrains along the river are rolling smoothly and are poorly cultivated.
Title: Paraná River steamers
Content:  The Paraná River is the second longest river in South America. Rising in Brazil, the river winds from the coastal mountains through tributaries and travels near Iguazu Falls 3000 mi into Paraguay, Argentina and the Rio de la Plata at Uruguay. The river allowed for transport and exploration of the continent. It also was the scene of some terrible wars, including naval. The River Plate Republics arose from the fall of the Spanish Empire in South America after 1811. The devolution of the colony into smaller republics because of Napoleons conquest of Spain first allowed the Viceroyalty of the Rio de la Plata into 

Question: where does the parana river flow?
Answer: Paraguay.