The black waters of the Rio Negro and the Anavilhanas archipelago near Manaus are the classic place to watch the Amazon pink river dolphin, or boto, one of the only dolphins on Earth living entirely in freshwater. Larger and stranger than its marine cousins, the boto flushes pink with age and weaves between drowned trees in the flooded forest, observed from small boats on quiet river outings. Sightings hold year-round, and the low-water months from August to November concentrate the dolphins in narrowing channels for the easiest, most frequent encounters.
Fauneya maps 1 Amazon River Dolphin spots worldwide, with monthly sighting probabilities and practical info for each location.