@bomprokieu

Sơn Đoòng cave , in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam, is the world's largest natural cave. As a solutional cave, it was formed in soluble limestone and is believed to be between 2 and 5 million years old. https://oxalisadventure.com/cave/son-doong-cave/

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