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