National Park Phong Nha - Ke Bang in Quang Binh - Central Vietnam. With an area of 200,000 hectares, Phong Nha - Ke Bang National Park is located in the districts of Quang Ninh, Bo Trach, Tuyen Hoa and Minh Hoa, Dong Hoi City and 50km northwest.
Besides the historical value of geology, topography, geomorphology, Phong Nha - Ke Bang is also blessed gift for the mysterious landscapes, majestic. National Park Phong Nha - Ke Bang hides many mysteries of nature, the cave as the magnificent castle in limestone mountains are artifacts from millions of years ago.
Phong Nha - Ke Bang is like a giant geological museum worth and global significance by complex geological structure, gathers many different rocks like sandstone, quartz, schist, slate siliceous limestone, stone mac container, stone granodiorite, diorite stone, stone aplite, pegmatite ... Phong Nha - Ke Bang also contains historical complex geological development, lasting from 400 million years of earth. Experiencing the important tectonic phase and phase fault movement, coordination platform, folded, making the rolling mountains and sedimentary basins with subsidence. These fluctuations also contributed to the diversity of geology, topography, geomorphology.
Karst, Phong Nha - Ke Bang has featured in many global developmental stages from late Ordovician - Silurian (463.9 to 430 million years ago) to Quaternary (1.75 million years ago). A peculiar characteristic here is the system of underground rivers and caves in the limestone mountains.
Non-limestone landforms region have in common is low mountains covered with vegetation on the surface. The process of creating the shelf eroded along the river valleys of the Son and Chay at the edges of the limestone in the center. Terrain transitions are different types of limestone interlayer.
Located in an area with average annual rainfall is quite high but the water here was soaked and undercurrents in the heart of the limestone, over millions of years has created numerous caves in the area. In Phong Nha - Ke Bang National Park has about 300 large and small caves are divided into three main systems: systems Phong Nha cave system and cave systems RUC Arch Trail.
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