Answer:
Most dolphins live in the ocean, but there are some species which live in freshwater rivers.
While most known species like the bottlenose and the spinner dolphins live in the sea, some other live in some of the most famous rivers in the world like the Amazon river, the Ganges River, the Yangtze River, the La Plata River and the Indus River.
The best known of all the freshwater species is the Amazon Pink Dolphin, also known as “Boto” who lives in the Amazon river.