“The Southern Ocean extends from the coast of Antarctica north to 60 degrees south latitude. The Southern Ocean is now the fourth largest of the world’s five oceans (after the Pacific Ocean, Atlantic Ocean, and Indian Ocean, but larger than the Arctic Ocean). The International Hydrographic Organization (IHO) has declared, named, and demarcated the Southern Ocean as a fifth, separate ocean.”
Typically we define oceans and seas based on their borders with land as their most important characteristics. Also, we rarely look at the bottom of the globe as the center of our global perspective. Those are a few of the reasons why American students usually have never heard of the Southern Ocean, but Australian students see it as one of the world’s main oceans.