<Tr> <Td_colspan="2"> Shore length is not a well - defined measure . </Td> </Tr> <P> The Atlantic Ocean is the second largest of the world's oceans with a total area of about 106,460,000 square kilometers (41,100,000 square miles). It covers approximately 20 percent of the Earth's surface and about 29 percent of its water surface area . It separates the "Old World" from the "New World". </P> <P> The Atlantic Ocean occupies an elongated, S - shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west . As one component of the interconnected global ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Equatorial Counter Current subdivides it into the North Atlantic Ocean and the South Atlantic Ocean at about 8 ° N . </P> <P> Scientific explorations of the Atlantic include the Challenger expedition, the German Meteor expedition, Columbia University's Lamont - Doherty Earth Observatory and the United States Navy Hydrographic Office . </P>

What is the shape of the atlantic ocean