The Paraguay River is a major river in south central South America, running through Brazil, Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

, Paraguay

Paraguay

Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

, and Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

. It flows about 2621 kilometres (1,628.6 mi) from its headwaters in the Brazilian state of Mato Grosso

Mato Grosso

Mato Grosso is one of the states of Brazil, the third largest in area, located in the western part of the country.Neighboring states are Rondônia, Amazonas, Pará, Tocantins, Goiás and Mato Grosso do Sul. It also borders Bolivia to the southwest...

 to its confluence with the Paraná River

Paraná River

The Paraná River is a river in south Central South America, running through Brazil, Paraguay and Argentina for some . It is second in length only to the Amazon River among South American rivers. The name Paraná is an abbreviation of the phrase "para rehe onáva", which comes from the Tupi language...

 north of Corrientes

Corrientes

Corrientes is the capital city of the province of Corrientes, Argentina, located on the eastern shore of the Paraná River, about from Buenos Aires and from Posadas, on National Route 12...

.
The Paraguay's source is south of Diamantino

Diamantino

Diamantino is a small town in Mato Grosso state in Brazil. Its has a population of 18.580, and is near Diamantino river. It is 1837 feet above sea-level, and sits at the foot of the Mato Grosso plateau. Its history dates from 1730 as a gold mining settlement. In 1746, diamonds were discovered,...

 in the Mato Grosso state of Brazil. It follows a generally southwesterly course, passing through the Brazilian city of Cáceres

Cáceres, Mato Grosso

Cáceres is an important town in the Brazilian state of Mato Grosso. It lies on the Paraguai River. Cattle ranching and fishing are the two most important economic activities of the town, and it is a popular tourist attraction during Festival Internacional de Pesca...

.