Board a slow boat from Manaus to see the weirdly sharp line where the dark Rio Negro hits the sandy Amazon. The water is acidic enough to keep mosquitoes away, making it way better for swimming than other jungle spots. Spend 4 hours on the water to catch the pink dolphins near Novo Airão. Skip the generic buffet tours; hire a private pequeri for a real look at the flooded Anavilhanas forests.
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