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Posts tagged Roraima

Convergence of Branco and Negro Rivers, Brazil – February 9th, 2013

1.4S 61.6W

February 9th, 2013 Category: Image of the day, Rivers

Brazil – January 23rd, 2013

This image of the Amazon Rainforest, in Brazil, also shows the confluence of the Branco River (right) and Negro River (left), near the border of the states of Amazonas and Roraima. The Rio Branco (meaning White River) is the principal affluent of the Rio Negro (meaning Black River) from the north.The Branco flows nearly south, and finds its way into the Negro through several channels and a chain of lagoons similar to those of the latter river. It is 350 miles (560 km) long.

The Rio Negro, in turn, is the largest left tributary of the Amazon and the largest blackwater river in the world. It flows into the Rio Solimões to form the Amazon River South of Manaus, Brazil. Rio Negro is navigable for 700 kilometres (430 mi) from its mouth in 1 metre of water in the dry season, but it has many sandbanks and minor difficulties. In the wet season, it floods the country far and wide, sometimes to a width of 30 kilometres (19 mi), for long distances, and for 650 kilometres (400 mi) upstream. During this time, from April until October, it is a succession of lagoons, full of long islands and intricate channels.

From the Northern Coast of South America to the Meeting of the Waters, Brazil

3.1S 60W

September 26th, 2011 Category: Rivers

Brazil - August 16th, 2011

This image stretches from the northenern coastline of South America, including Guyana, Suriname and French Guiana, across the Brazilian state of Roraima to the state of Amazonas.

Visible near the lower edge is the Amazon River. In the lower left corner, near the city of Manaus, the Meeting of Waters (Portuguese: Encontro das Águas) can be observed. It is the confluence between the Rio Negro, a river with dark (almost black coloured) water, and the sandy-coloured Amazon River or Rio Solimões, as it is known the upper section of the Amazon in Brazil. For 6 km (3.7 mi) the river’s waters run side by side without mixing. It is one of the main tourist attractions of Manaus, Brazil.

This phenomenon is due to the differences in temperature, speed and water density of the two rivers. The Rio Negro flows at near 2 km per hour at a temperature of 28°C, while the Rio Solimões flows between 4 to 6 km per hour a temperature of 22°C.

Waterways near Roraima-Amazonas Border, Brazil

May 7th, 2009 Category: Rivers

Roraima-Amazonas border, Brazil - April 20th, 2009

Roraima-Amazonas border, Brazil - April 20th, 2009

Roraima is the northernmost and least populated state of Brazil, located in the Amazon region. It borders the states of Amazonas and Pará, as well as the nations of Venezuela and Guyana. Here an area along the border between Roraima (above) and Amazonas (below) can be observed.

One third of the state’s territory is covered by the Amazon Forest. In the south is fertile arable land.

Roraima has a rich network of waterways in the Amazon basin with rivers such as the Branco, Uraricoeira, Catrimani, Alalaú and Tacutu. Here, a wetlands area between Rio Araçá (far left) and Rio Branco can be seen, north of where the numerous rivers in the area meet the Rio Negro.

Except in the higher mountains where the climate is cooler but very wet, Roraima has an equatorial climate. This is a type of tropical climate in which there is no dry season – all months have mean precipitation values of at least 60 mm.