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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.

Lagoons and Estuaries Along Coast of South America

32.7S 52.7W

November 8th, 2012 Category: Lakes, Sediments

Argentina – October 26th, 2012

Sediments can be seen in various bodies of water along the coast of South America. In the lower left quadrant is the Río de la Plata Estuary, between Argentina (minimally visible at the left edge) and Uruguay. The city of Montevideo can be seen along the shoreline by the estuary. Moving northeastward up the coast, Laguna Merín (or Lagoa Mirim) appears filled with greyish brown sediments, while Lagoa dos Patos, further up the coast in Brazil, shows sediments with a more reddish hue.

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.

Lagoons and Lakes in Southern Brazil and Uruguay

28.2S 48.7W

February 18th, 2012 Category: Lakes

Brazil - December 29th, 2011

Several bodies of water can be observed in this image of southern Brazil and Uruguay. Near the top edge, partially covered by clouds, is Lagoa dos Patos (Lagoon of the Ducks), in the Brazilian state of Rio Grande do Sul. It appears tan from sediments. Further south is Lagoa Mirim (Laguna Merín), straddling the border of Brazil and Uruguay. The sediments coloring its waters are darker brown.

Moving westward, to near the left edge of the image, is the Lago Rincón del Bonete. It is the largest body of water in Uruguay. It is located in the middle of the country in the south part of Tacuarembó Department with a small part of it reaching into the north part of Durazno Department. It is an artificial lake formed by a dam on the course of Río Negro. It was constructed in 1945 and has a surface of about 1240 sqkm.

High Vegetation Index in Misiones Province, Argentina – January 4th, 2012

26.9S 54.4W

January 4th, 2012 Category: Image of the day, Lakes, Vegetation Index

Uruguay, Brazil, Argentina - December 29th, 2011

This FAPAR image shows the vegetation index of northeastern Argentina (top left), southern Brazil (above) and Uruguay (below). Visible near the coast are two lagoons: Lagoa dos Patos (above) and Lagoa Mirim (below, called Laguna Merín in Spanish). The Rio de la Plata Estuary can also be observed at the bottom left of the full image.

The vegetation index is highest (rusty red) to the northwest, in Argentina’s Misiones Province. The rest of the land shows a generally good index of photosynthetic activity (green), with some areas of high activity interspersed throughout.

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