It was first discovered in 199

Mountain River Cave, Vietnam

Hang Sơn Đoòng, another example of the most amazing photos shown in this article, is a solutional cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam. As of 2009 it has the largest known cave passage cross-section in the world and is located near the Laos–Vietnam border.

Inside is a large, fast-flowing subterranean river. It was formed in Carboniferous/Permian limestone and as you can see, makes an amazing picture.

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