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Sơn Đoòng tops list of 10 greatest natural caves in the world

Originally discovered in 1991 by a Vietnamese man called Hồ Khanh, Sơn Đoòng Cave is located in the Phong Nha–Kẻ Bàng National Park, Quảng Bình, and was recognised as a world natural heritage by UNESCO.   HÀ NỘI — US website Wonderslist recently announced its top 10 most magnificent natural caves in the world, with Sơn Đoòng …

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