Bing Wallpaper: Sơn Đoòng cave in Phong Nha-Kẻ Bàng National Park, Vietnam

Sơn Đoòng cave in Phong Nha-Kẻ Bàng National Park, Vietnam

© David A Knight/Shutterstock - 2021-01-02

rock atmospheric phenomenon formation geology cave bedrock natural arch erosion outcrop green algae fog moss

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