The National Park of Phong Nha-Ke Bang in the districts of Quang Ninh, Tuyen Hoa, and Minh Trạch (Quang Binh province) with an area of about 200,000 hectares.Phong Nha-Ke Bang is such a giant geological Museum has value and meaning. The important tectonic phase and the phase fault movement, mixing platform, the fold of the Earth's crust from 400 million years ago created the mountains overlap scallops and the sediment basin subsidence. Besides, Phong Nha-Ke Bang is also natural for a majestic cave system in limestone mountain. Here, in April 2009, the expedition in British caving Association has discovered and published the Painted cave Đoòng is the largest cave in the world (height 200 m, 150 m wide, at least 8 long, 5 km). Decent national-Ke Bang also contains a dynamic system of plant variety, among which many rare species located in the Vietnam Red Book and the Red Book of the world.
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