The Meeting of Waters is a phenomenon that happens at the confluence between the black river of black water and the Solimões river of muddy water, where the waters of the two rivers run side by side without mixing for an extension of more than 6 km . It is one of the main tourist attractions of the city of Manaus.
This phenomenon occurs due to the difference between the temperature and density of the waters and also the speed of their current: the Rio Negro runs about 2 km / h at a temperature of 28 ° C, while the Solimões River runs from 4 to 6 km / h at a temperature of 22 ° C. 
There are dozens of tourist agencies that offer the tour to the region, in itineraries that usually include a return by the igarapés of the region. If the tour is done in a small boat, the visitor can put his hand in the water during the crossing of the waters, and feel that the rivers have different temperatures.
In the period of the full river that goes from January to July is the best time to take a walk to observe the encounter of the waters, since the exits between the igarapés are in motorized canoes. You can enter the holes and arms of rivers and have the possibility to see animals like birds, monkeys and sloths.