The encounter of the waters is a natural phenomenon easily seen in many rivers of the Amazon. The factors for this occur in the region vary from geological, climate, thermal issues or even the size or acidity of rivers. Thanks to Luiz for the card.
The Meeting of Waters is the confluence between the dark (blackwater) Rio Negro and the pale sandy-colored (whitewater) Amazon River, referred to as the Solimões River in Brazil upriver of this confluence. For 6 km the two rivers' 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/h at a temperature of 28 °C (82 °F), while the Rio Solimões flows between 4 and 6 km/h at a temperature of 22 °C."
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