Marineland of Florida, one of Florida's first marine mammal parks, is billed as "the world's first oceanarium". Marineland functions as an entertainment and swim-with-the-dolphins facility, and reopened to the public on March 4, 2006. In 2011, the park was purchased by the Georgia Aquarium for a reported $9.1 million.

A marine mammal park is a commercial theme park or aquarium where marine mammals such as dolphins, beluga whales and sea lions are kept within water tanks and displayed to the public in special shows. A marine mammal park is more elaborate than a dolphinarium, because it also features other marine mammals and offers additional entertainment attractions. It is thus seen as a combination of a public aquarium and an amusement park. Marine mammal parks are different from marine parks, which include natural reserves and marine wildlife sanctuaries such as coral reefs, particularly in Australia.