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The world is marked by hundreds of thousands of islands, which are classified as landmasses permanently above water but not identified as a continent, such as Australia. The largest island on earth is Greenland, but there are countries made up mostly, or entirely, of archipelagos—chains, clusters, or collections of islands. In some cases, like Norway and Sweden, these amount to more than 200,000 islands within the countries' borders.
Details at World Atlas