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Sediments in Lagoa Mirim and Lagoa dos Patos, Brazil and Uruguay

32.7S 52.7W

December 3rd, 2012 Category: Lakes, Sediments

Uruguay and Brazil – December 2nd, 2012

Lagoa Mirim, as it is known in Brazil, or Laguna Merín in Uruguay, is a large estuarine lagoon which extends from the southern Rio Grande do Sul state in Brazil into eastern Uruguay. Lagoa Mirim is about 108 miles (174 km) long by 6 to 22 miles (35 km) wide.

Lagoa Mirim is separated from the Atlantic Ocean by a sandy, partially barren isthmus. It is more irregular in outline than its larger neighbor to the north, Lagoa dos Patos, and discharges into the latter through São Gonçalo Channel, which is navigable by small boats. Here, Lagoa Mirim appears greyish brown, while its neighbor to the north shows a mix of dark brown, reddish tan and green.

Both lagoons are the remains of an ancient depression in the coastline shut in by sand beaches built up by the combined action of wind and oceanic currents. They are at the same level as the ocean, but their waters are affected by the tides and are brackish only a short distance above the Rio Grande outlet.

Array of Colors from Sediments in Lagoa dos Patos, Brazil

31.1S 51.4W

July 10th, 2012 Category: Lakes, Sediments

Uruguay and Brazil – July 9th, 2012

Sediments and phytoplankton growth give the Lagoa dos Patos, in southern Brazil’s state of Rio Grande do Sul, an array of different colors. Tan sediments can be seen entering the lagoon in the northern part, near the city of Porto Alegre, while reddish brown sediments enter below the middle by the upper shoreline, near the city of São Lourenço do Sul. The southern part of the lagoon is more green in color. Further south, greyish tan sediments can be observed in Lagoa Merim (Laguna Merín), on the Brazil-Uruguay border. Sediments also line the Atlantic shoreline between the two lagoons.

Interconnected Lagoons by Brazil-Uruguay Border: Lagoa dos Patos and Lagoa Mirim

31.1S 51.4W

May 17th, 2012 Category: Lakes

Uruguay, Brazil, Argentina - May 17th, 2012

Visible near the shoreline in the upper part of this image is the Lagoa dos Patos (meaning Lagoon of the Ducks), the second largest lagoon in Latin America and the biggest in Brazil. It is located in the state of Rio Grande do Sul, southern Brazil.

The lagoon is 174 miles (280 km) long, has a maximum width of 44 miles (70 km), and a total area of 3,803 sq. mi. (9,850 km). It is separated from the Atlantic Ocean by a sandbar about 5 miles (8 kilometers) wide. 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.

Lagoa Mirim (or Laguna Merín in Spanish) is a large estuarine lagoon which extends from southern Rio Grande do Sul state in Brazil into eastern Uruguay. Lagoa Mirim is separated from the Atlantic Ocean by a sandy, partially barren isthmus.

Lagoa Mirim is about 108 miles (174 km) long by 6 to 22 miles (35 km) wide. It is more irregular in outline than its larger neighbor to the north, Lagoa dos Patos, and discharges into the latter through São Gonçalo Channel. Lagoa Mirim has no direct connection to the Atlantic, but the Rio Grande, a tidal channel about 24 miles (39 km) long which connects Lagoa dos Patos to the Atlantic, affords an entrance to the navigable inland waters of both lagoons and several small ports.

Porto Alegre by Shores of Lagoa dos Patos, Brazil

30S 51.2W

November 16th, 2011 Category: Lakes

Brazil - November 13th, 2011

This orthorectified wide-swath ASAR image shows the city of Porto Alegre, in the Brazilian State of Rio Grande do Sul. The city is situated by the shores of the freshwater Lagoa dos Patos, the second largest lagoon in Latin America and the biggest in Brazil. It is 174 miles (280 km) long, has a maximum width of 44 miles (70 km), and a total area of 3,803 sq. mi. (9,850 km).

Porto Alegre, appearing as a bright white area near the northern shores of the lagoon, is the tenth most populous municipality in Brazil and the capital city of the country’s southernmost state, Rio Grande do Sul. The city lies on the eastern bank of the Guaíba River estuary, where five rivers converge to form the Lagoa dos Patos.

Sediments in Lagoa dos Patos, Southern Brazil

31.1S 51.4W

August 18th, 2011 Category: Lakes

Brazil - August 12th, 2011

Sediments give a brown color to the Lagoa dos Patos (below), meaning “Lagoon of the Ducks” in English, located in the state of Rio Grande do Sul, in southern Brazil. It the second largest lagoon in Latin America and the biggest in Brazil, with a length of 174 miles (280 km), a maximum width of 44 miles (70 km), and a total area of 3,803 sq. mi. (9,850 km).

The lagoon is separated from the Atlantic Ocean by a sandbar about 5 miles (8 kilometers) wide. 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.

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