Sơn Đoòng hai lần được Sách Guinness vinh danh
Sách kỷ lục Guinness hai lần vinh danh Sơn Đoòng là hang động lớn nhất thế giới. Vườn quốc gia Phong Nha đang đề xuất tỉnh Quảng Bình tổ chức công bố kỷ lục này.
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