They are very intelligent animals with an enormous capacity of communication between them. Although the marine bottlenose dolphin is the most famous dolphin species, there are freshwater dolphins such as the river dolphins that live in rivers in Asia and South America.. Most dolphins are marine and live in the ocean or brackish waters along coastlines. Dolphins are cetacean mammals that live in marine and continental waters. River dolphin, any of six species of small, usually freshwater mammals that are related to whales. What rivers do dolphins live in? They inhabit rivers of south-central Asia, China, and South America and the coastal waters of Brazil, Argentina, and Uruguay and differ from other dolphins in their long beaks and rounded foreheads. Amazon river dolphin (or Boto), Inia geoffrensis – Largest of river dolphins, lives in Peru and Brazil. The South Asian river dolphin (Platanista gangetica) lives in the rivers Ganges and Indus. Also known as the pink river dolphin or boto, the Amazon river dolphin can only live in freshwater. Dolphins will also drive fish into shallow waters for easier hunting; in some areas, they do so in cooperation with human fishermen. This water mammal is the largest of all the other river dolphin species, and cannot survive in salt water. Araguaia river dolphin , Inia araguaiaensis – Recently discovered in the river basin in Brazil after which it … Also known as the ‘Pink River Dolphin’ or the ‘Boto’, they are not to be confused with the marine pink dolphins. The Amazon River Dolphin is a group of dolphins that primarily dwell in the South Americas waters, especially in the Amazon river. It is found throughout much of the Amazon and Orinoco River Basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. Bottlenose dolphins also entrap fish in “nets” of expelled bubbles. There are/were several species of fresh water/brackish water dolphins.