In layman's terms, the four oceans are also used to refer to all the oceans on the earth. The ocean area of the four oceans is 36 1 10,000 square kilometers, of which the Pacific Ocean accounts for 49.8%, the Atlantic Ocean for 26%, the Indian Ocean for 20% and the Arctic Ocean for 4.2%.
Pacific Ocean
1520, Magellan entered a strait (later called strait of magellan) while sailing around the world, and walked out of the canyon in a calm way, so he called this water area the Pacific Ocean, which was later recognized by the whole world.