What is the most common place to find a dolphin?

The most common place to find dolphins is in oceans, particularly in coastal areas and estuaries.

While they can be found in other places, including:

* Rivers (some species, like the Amazon River dolphin)

* Seas (the Mediterranean Sea, for example)

* Open ocean (especially in areas with high productivity)

Oceans are their primary habitat, and coastal areas offer a good balance of food sources, protection from predators, and access to shallow waters for mating and birthing.