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Lagoa dos Patos, Brazil

May 15th, 2009 Category: Lakes

Lagoa dos Patos, Brazil - May 11th, 2009

Lagoa dos Patos, Brazil - May 11th, 2009

Lagoa dos Patos is 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. 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).

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. The Rio Grande, at the south end of Lagoa dos Patos, forms the outlet to the Atlantic.

This lagoon is evidently the remains of an ancient depression in the coastline shut in by sand beaches built up by the combined action of wind and current. It is at sea level, but its waters are affected by the tides and are brackish only a short distance above the Rio Grande outlet.

Here, its brackish waters indeed appear green, as sediments are present throughout the lagoon and then spread along the coast on the other side of the sandbar.

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.

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.

Vegetation Index of Uruguay Near Laguna Merín

33.5S 54.1W

November 11th, 2011 Category: Vegetation Index

Uruguay - November 10th, 2011

This FAPAR image shows the vegetation index of Uruguay, as well as parts of Brazil (visible in the upper part of the full image). Visible at the upper right of the thumbnail is Laguna Merín (Lagoa Mirim in Portuguese).

The vegetation index is generally good (green) to high (rusty red), with some interesting striations of the two in the upper part of the image. Photosynthetic activity is lowest (yellow) near the shores of Laguna Merín.