Hang Sơn Đoòng

Hang Sơn Đoòng

Sơn Đoòng cave (Vietnamese: hang Sơn Đoòng, IPA: [haːŋ˧ ʂəːn˧ ɗɔ̤ŋ˨˩]) is the world's largest natural cave, in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam.

Located near the Laos–Vietnam border, Hang Sơn Đoòng has an internal, fast-flowing subterranean river and the largest cross-section of any cave, worldwide, as of 2009, believed to be twice that of the next largest passage. It is the largest known cave passage in the world by volume.

Its name, Hang Sơn Đoòng, is variously translated from Vietnamese as 'cave of the mountain river' or 'cave of mountains behind Đoòng [village]'.

As a solutional cave, it was formed in soluble limestone and is believed to be between 2 and 5 million years old.

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