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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 (six km) without mixing. The separation is apparently caused by the difference in temperature, density and flow rate of the waters from each river: This photo was taken as my plane approached Manaus airport for landing. This known as " The Meeting of the Waters" and all visits to Amazonia seem to include a boat trip to see this phenomenon.