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It is found by a local man named Ho Khanh in 1991 and was recently discovered in 2009 by British cavers, led by Howard Limbert. The name "Son Doong" cave means "mountain river cave", It was created 2-5 million years ago by river water eroding away the limestone underneath the mountain Where the limestone... Phong Nha – Ke Bang National Park lies in Quang Binh Province - the central Vietnam. Covering an area of about 200,000 hectares, Phong Nha – Ke Bang situated in Quang Ninh, Bo Trach, Tuyen Hoa and Minh Hoa districts, is 50km northwest of Dong Hoi City. http://svietnamtourism.blogspot.com/2014/11/a-nature-world-heritage-phong-nha-ke.html