
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
Sơn Đoòng cave in Phong Nha-Kẻ Bàng National Park, Vietnam - Bing Wallpapers - Sonu Rai