Concept:
Geographically, an island is defined as a landmass surrounded entirely by water. When ranking islands, continents (like Australia) are excluded from the definition because they are tectonic landmasses of a much larger scale.
Step 1: Distinguishing between continents and islands.
Although Australia is surrounded by water, it is classified as a continent. Therefore, in the context of global geography, Australia is not categorized as an "island."
Step 2: Comparing the land mass of candidates.
Greenland covers an area of approximately 2.16 million square kilometers. It is significantly larger than other major islands like New Guinea or Borneo.
Step 3: Conclusion on the largest island.
Based on territorial surface area, Greenland is officially recognized as the largest non-continental island on Earth.
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World's Largest Island = Greenland
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Greenland
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