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Indonesian Geography
The biggest island of Indonesia is ________.
Explanation and memory cue
The largest island that Indonesia fully controls is Sumatra, which is larger than Sulawesi, Java, and Seram. However, the largest island that Indonesia shares with another country is New Guinea (Western New Guinea or Papua), which is larger than Sumatra but shared with Papua New Guinea. Borneo is also shared with Malaysia and Brunei and is larger than Sumatra. Since the question options do not include New Guinea or Borneo, the correct answer among the given options is Sumatra.