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In which national park is Hang Sơn Đoòng, the world's largest natural cave passage, located?

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Correct answer: Phong Nha-Kẻ Bàng National Park

Hang Sơn Đoòng is nestled inside Phong Nha-Kẻ Bàng National Park in central Vietnam. The cave is so massive that it has its own localized weather system, complete with internal clouds and a thriving rainforest. It was only fully explored by British cave researchers in 2009. Photo: Doug Knuth from Woodstock, IL, Wikimedia Commons, CC BY-SA 2.0.

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Source: Wikipedia (CC BY-SA)

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