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The Encontro das Aguas, where the black waters of the Rio Negro meet the muddy yellow flow of the Rio Solimoes, is a memorable sight, and is just a 20 minute boat trip from Porto da Ceasa. The two rivers flow side by side for more than six km, their waters divided as though by an invisible barrier. The phenomenon is caused by the differences in water temperature, density and current speed of the two rivers. While the Rio Negro flows at around 2 km/h and has a temperature of 22°C, the Rio Solimoes moves at between 4 and 6 km/h and has a temperature of 28°C. There are plenty of tourist agencies that will take you to the spot, and the price will usually include a trip along the smaller streams of the area. It is best to visit between January and July, when river levels are high and the journey can be made by motorized canoe, allowing access to the inlets and creeks of the two rivers, to see the Amazon flora and fauna up close.