世界：大洲和大洋 - Geografispel

There are seven continents and five oceans on the planet. In terms of land area, Asia is by far the largest continent, and the Oceania region is the smallest. The Pacific Ocean is the largest ocean in the world, and it is nearly two times larger than the second largest. The Pacific Ocean also contains the Mariana Trench, which is the deepest known part of the world’s oceans. Its deepest point reaches seven miles down into the Earth.