According to Britannica, an island is a mass of land that is both “entirely surrounded by water” and also “smaller than a continent.” By that definition, Australia can't be an island because it's already a continent.
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As the country of Australia is mostly on a single landmass, and comprises most of the continent, it is sometimes informally referred to as an island continent, surrounded by oceans. Papua New Guinea, a country within the continent, is one of the most culturally and linguistically diverse countries in the world.
Russia, the largest country in Europe and the world, ranks first, with a total area of 17,098,242 km². Ukraine ranks second largest country in Europe, with 603,500 km², followed by France with 551,695 km², Spain with 505,992 km², and Sweden with 450,295 km².
Sandy Island (sometimes labelled in French Île de Sable, and in Spanish Isla Arenosa) is a non-existent island that was charted for over a century as being located near the French territory of New Caledonia between the Chesterfield Islands and Nereus Reef in the eastern Coral Sea.