The largest ocean in the world is the Pacific Ocean. Covering more than 63 million square miles, it spans from the Arctic in the north to the Southern Ocean in the south, making it larger than all of Earth's landmasses combined. The Pacific is home to a diverse range of marine life and ecosystems, including coral reefs, deep trenches, and various species that contribute significantly to global biodiversity. It plays a vital role in regulating the Earth's climate and weather patterns. Furthermore, it serves as an essential route for global trade and transportation between continents.