Q. Which country's highest mountain is "Puncak Jaya"?
Answer: Indonesia
Notes: Indonesia's highest mountain is "Puncak Jaya". Puncak Jaya, also known as  Carstensz Pyramid or Mount Jayawijaya or Mount Carstensz, is the highest mountain in Indonesia, on the island of New Guinea, with an elevation of 4,884 m. It is the highest peak of an island on Earth, and the highest peak in Oceania. Located in the Sudirman Range of the western central highlands of Papua Province, Indonesia.

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