Discounting Australia which is the largest island in the world (Geographers insist on calling it a continental land mass to me it is still an island)
Island continental lithosphere, so it floats low on the mantle. Islands are either extensions of the oceanic crust (e.g. volcanic islands) or geologically they are part of some continent sitting on continental lithosphere (e.g. Greenland). This holds true for Australia, which sits on its own continental lithosphere and tectonic plate. Continental islands are bodies of land that lie on the continental shelf of a continent. Examples are Borneo, Java, Sumatra, Sakhalin, Taiwan and Hainan off Asia; New Guinea, Tasmania, and Kangaroo Island off Australia; Great Britain, Ireland, and Sicily off Europe; Greenland, Newfoundland, Long Island, and Sable Island off North America;
Melville Island (Australia) Melville Island (Australia) Melville Island, known in the Tiwi language as Yermalner, is an island in the eastern Timor Sea, off the coast of the Northern Territory, Australia. It is west of the Cobourg Peninsula in Arnhem Land and north of Darwin, with a tropical climate. The largest community/town on the island is Milikapiti, pop. 559. The second village is Pirlangimpi (Pularumpi, formerly Garden Point), pop. 440, 27 km west of Milikapiti, on the west coast of Melville Island. About 30 more people live in five family outstations. At it is just outside the 100 largest islands in the world,