Geography - Regions and continents - Islands - Island geography
Which is the largest island in the world?
Correct!
Greenland is the world's largest island. It lies between the Arctic Ocean and the North Atlantic and covers more than 2.1 million square kilometers. Most of the island is covered by a massive ice sheet. Geographically, Greenland is part of North America; politically, it is an autonomous territory within the Kingdom of Denmark. Under the usual geographic classification, Australia is counted as a continental landmass rather than an island.
Greenland is considered the largest island because Australia is usually classified as a continent rather than an island.
Source: Guinness World Records


