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On which Philippine island can you find the famous Subterranean River National Park, a UNESCO World Heritage site?

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Correct answer: Palawan

The Puerto Princesa Subterranean River National Park is located on the island of Palawan. It features an incredible limestone karst landscape with an 8.2-kilometer navigable underground river. The river flows directly into the sea, making its lower portion subject to tidal influences. Photo: Ron Van Oers, Wikimedia Commons, CC BY-SA 3.0 igo.

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Source: Wikipedia (CC BY-SA)

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