At about 3 million square miles (7.7 million square km), Australia is the smallest continent on Earth, but some of geographer believe that Australia is not an island. Greenland is officially the world's largest island that is not a continent. Home to 56,000 people, Greenland has its own extensive local government, but it is also part of the Realm of Denmark. THE LARGEST ISLANDS IN THE WORLDISLAND, AREA, OCEAN, HIGHEST POINT, ALTITUDE (m)Australia, 7,740,000 km2, Indian and Pacific, Mount Kosciusko, 2,228Greenland, 2,166,086 km2, Arctic, Gunnbjorn, 3,733New Guinea, 792,500 km2, Pacific, Puncak Jaya, 4,884Borneo, 725,500 km2, Pacific, Mount Kinabalu, 4,095Madagascar, 587,040 km2, Indian, Mount Maromokotro, 2,876Baffin Island, 507,500 km2, Arctic, Mount Odin, 2,147Sumatra, 427,300 km2, Indian, Mount Kerinci, 3,805Honshu, 227,400 km2, Pacific, Mount Fuji, 3,776Great Britain, 218,100 km2, Atlantic, Ben Nevis, 1,344Victoria, 217,300 km2, Arctic, unnamed summit, 655