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Q. What is the name of the world's longest underground river located in the Philippines?
Answer: Puerto Princesa Subterranean River
Notes: The Puerto Princesa Subterranean River, located in the Philippines, is renowned as the world's longest navigable underground river. Stretching over 8.2 kilometers within a UNESCO World Heritage Site, it is celebrated for its breathtaking limestone karst landscapes, extensive cave systems, and diverse ecosystem.

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📌 Question Number: 299 in Physical Geography - Important Rivers, River Islands, Deltas and Lakes in the above course in App.