Guaíba River

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The Guaíba River is a waterway in Rio Grande do Sul state of southern Brazil. The Guaíba is an extension of the Lagoa dos Patos, a huge coastal lagoon to the south, and although commonly referred to as a river, the Guaíba is a brackish water estuary, and is also referred to as a bay, lake, or lagoon. The Jacuí River empties into the Guaíba from the north.

The city of Porto Alegre lies on the eastern shore of the Guaíba River, and the city of Guaíba lies opposite Porto Alegre on the western shore. The Guaíba is navigable, and is connected to the Atlantic Ocean via the Lagoa dos Patos and its outlet channel, the Rio Grande.