Dolphins live in all of the world's oceans. They are also found in several major river systems, including the Indus, the Ganges and the Amazon. No one species lives in every ocean, but every ocean has at least one dolphin species present.
The most common and familiar dolphin, the common bottlenose, is found in temperate and tropical waters worldwide. The bottlenose is the most common dolphin species along the North American coast but is widespread in the Pacific Ocean. It also is found in the Mediterranean Sea and Black Sea. Bottlenose dolphins are limited to areas with surface water temperatures between 10 and 32 degrees Celsius.