Lagoa dos Patos
General data
- Name: Lagoa dos Patos
- Water system: Atlantic Ocean
- Water type: Estuary
- Progression: Rio Grande Channel -> Atlantic Ocean -> Planet Earth
- Climates: Tropical
- Continents: South America
- Countries: Brazil
Lagoa dos Patos (Portuguese pronunciation: [laˈɡoɐ dus ˈpatus]; English: Ducks' Lagoon) is a coastal lagoon located in the state of Rio Grande do Sul, southern Brazil. It covers an area of 10,100 km2, is 290 kilometres long and has a maximum width of 71 kilometres. It is the largest choked coastal lagoon in the world, the largest coastal lagoon in South America, and the largest lagoon in Brazil. Lagoa dos Patos is separated from the Atlantic Ocean by a sandbar about 8.0 kilometres wide. The Jacuí-Guaíba and Camaquã Rivers empty into it, while the navigable São Gonçalo Channel, which enters Lagoa dos Patos near the town of Pelotas, connects Lagoa dos Patos to Lagoa Mirim to the south. The Rio Grande, at the south end of Lagoa dos Patos, forms the outlet to the Atlantic.