Hang Son Doong ( Vietnam ) | Heaven in VietNam | The largest cave in the world ! from 2010 world cu Watch Video
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Description: Hang Sơn Đoòng ('cave of the mountain river' or 'mountain cave of Đoòng [village]' in Vietnamese),[disputed – discuss] also known as Sơn Đoòng cave (often without the tone marks) 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 Ca