The “Meeting of Waters” Near Manaus, Brazil – October 24th, 20093.1S 60W
The city of Manaus, the capital of the state of Amazonas in Brazil, is situated at the confluence of the Negro and Solimões Rivers. The Negro River, true to its name, appears to have black waters, while the Solimões (or Upper Amazon) River is light brown.
The two rivers’ confluence is called the Meeting of Waters (in Portuguese, Encontro das Águas). For 6 km (3.7 mi) the rivers’ waters run side by side without mixing (near right edge, southeast of the city). This phenomena is due to differences in temperature, speed and water density of the two rivers. The Negro River flows at near 2 km per hour at a temperature of 22°C, while the Solimões River flows between 4 to 6 km per hour at a temperature of 28°C.