The five major oceans on Earth are Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean, and Southern Ocean. However, the Southern Ocean is considered as the southern portions of Pacific Ocean, Indian Ocean, and Atlantic Ocean. This consideration comes from the fact that there is no major continents separated Southern Ocean to other ocean.
The Atlantic Ocean, the Arctic Ocean, the Indian Ocean, the Pacific Ocean and the Southern Ocean. The Pacific Ocean is the largest ocean covering 64 million square miles.