The smallest ocean in the world is the Arctic Ocean. Located in the northern polar region, this ocean covers approximately 5.4 million square miles. Countries that border this ocean include Canada, Greenland, Russia, Norway and the United States through Alaska's coastline.
Ice covers the Arctic Ocean for most of the year, but it is still home to a variety of marine life. Fish, squid, seals and whales all live in this frigid ocean, while polar bears scavenge for food on the surface ice. By contrast, the world's largest ocean, the Pacific Ocean, is more than 10 times the size of the Arctic Ocean.