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The beautiful sky viewed from Ngu Lao Hole – PHOTOS: THU HUONG |
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Mountains are half hidden in white clouds in Cao Bang’s Hoa An Commune |
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A “gate of heaven” in Dam Thuy Commune |
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An explorer poses for a photo in a cave in Ngu Lao limestone mountainous area |
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Stalactites and stalagmites in a big cave in Van Trinh Commune |
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Plants at the entrance of another cave in Van Trinh |
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A lonesome giant limestone mass |