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The Meeting of the Waters, The Amazon

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The Rio Negro
The Rio Negro

The Meeting of the Waters

Where the dark waters of the Rio Negro join the lighter muddy waters of the Rio Solimoes a natural phenomenon is caused: the separate shades of water run side by side for a length of more than four miles (6km) without mixing. The separation is apparently caused by the difference in temperature, density and flow rate of the waters from each river: Rio Negro travels at about a mile (2km) per hour with a temperature of 72ºF (22ºC) while Rio Solimoes flows at between two and four miles (4-6km) per hour with a temperature of 82ºF (28ºC). This phenomenon has become a major tourist attraction in Brazil, best accessed by taking an hour's journey by boat from the floating docks in Manaus.
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