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Posts tagged Lagoon

Lagoa Mirim in Brazil and Uruguay

32.5S 52.7W

March 14th, 2010 Category: Lakes, Rivers, Sediments

Brazil - February 24th, 2010

Brazil - February 24th, 2010

Lagoa Mirim (Portuguese) or Laguna Merín (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. Here, greyish brown sediments fill the lagoon, while tan-colored sediments frame the oceanic coastline.

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, which is navigable by small boats.

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.

Both lakes are the remains of an ancient depression in the coastline shut in by sand beaches built up by the combined action of wind and current. 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.

The Jaguarão/Yaguarón River, which forms part of the Brazil-Uruguay boundary line, empties into Lagoa Mirim, and is navigable 26 miles (42 km) up to and beyond the twin towns of Jaguarão (Brazil) and Rio Branco (Uruguay).

Sediments in Lagoa dos Patos, Brazil

31.7S 52W

March 5th, 2010 Category: Lakes, Rivers

Brazil - February 24th, 2010

Brazil - February 24th, 2010

Sediments color Lagoa dos Patos (English: Duck Lagoon) tan and frame the nearby Brazilian coastline. 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.

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