Borneo neighbor

Answer:

SUMATRA

Hint:

This large Indonesian island is known for its dense rainforests and is home to the critically endangered Sumatran orangutan. It lies west of the Malay Peninsula.

Explanation:

Borneo neighbor" points to Sumatra because they’re both major islands in Indonesia, sitting right next to each other on the map. The clue is straightforward geography—no wordplay or tricks—just naming a well-known island that shares maritime borders with Borneo. If you’re familiar with Southeast Asia, Sumatra stands out as the obvious answer.

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