The Pacific and Atlantic are two of the world's five major OCEANS. The Pacific Ocean is the largest ocean in the world, covering an area of about 63 million square miles. The Atlantic Ocean is the second-largest ocean, covering an area of about 41 million square miles. Both OCEANS are connected by the Arctic Ocean, which lies between them. The Pacific and Atlantic OCEANS are home to a variety of marine life, including whales, dolphins, sharks, and other fish species.