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The Pelotas River
(peˈlɔtɐs) is a river in southern Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
, and a tributary
A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...
of the Uruguay River
The Uruguay River is a river in South America. It flows from north to south and makes boundary with Brazil, Argentina, and Uruguay, separating some of the Argentine provinces of the Mesopotamia from the other two countries...
The river originates in the Serra Geral
The Serra Geral is a mountain range in southern Brazil, constituting the southern portion of the Serra do Mar system which runs along Brazil's southeastern coast. The Serra Geral runs parallel to the Atlantic coast in Santa Catarina and northern Rio Grande do Sul states, separating a narrow coastal...
at Alto do Bispo and flows northeast for 450 kilometres (279.6 mi) before meeting the Canoas River
The Canoas River is a river of Santa Catarina state in southeastern Brazil. The river joins the Pelotas River to form the Uruguay River.-See also:*List of rivers of Santa Catarina-References:* ] map]...
, forming the Uruguay River. It forms the border between Rio Grande do Sul
Rio Grande do Sul is the southernmost state in Brazil, and the state with the fifth highest Human Development Index in the country. In this state is located the southernmost city in the country, Chuí, on the border with Uruguay. In the region of Bento Gonçalves and Caxias do Sul, the largest wine...
and Santa Catarina states.
The river is dammed by the Machadinho
The Machadinho Hydroelectric Power Plant is a dam and hydroelectric power plant on the Pelotas River near Machadinho on the border of Santa Catarina and Rio Grande do Sul, Brazil. The power station has a 1,140 MW capacity and is supplied with water by a concrete face rock-fill embankment dam...
and Barra Grande Dams
The Barra Grande Hydroelectric Power Plant is a dam and hydroelectric power plant on the Pelotas River near Celso Ramos on the border of Santa Catarina and Rio Grande do Sul, Brazil. The power station has a 708 MW capacity and is supplied with water by a concrete face rock-fill embankment dam, the...