The karst formation of Phong Nha-Ke Bang National Park has evolved since the Palaeozoic (some 400 million years ago) and so is the oldest major karst area in Asia. Subject to massive tectonic changes, the park's karst landscape is extremely complex with many features of geologic significance, and many cave formations such as stalactites and stalagmites. The vast area, extending to the border of the Lao People's Democratic Republic, contains spectacular formations including 65 km of caves and underground rivers. The Phong Nha caves are reached through a pleasant river journey starting in the village of San Trach. The visits include one cave that is reached through an underwater river, and one cave that is reached after climbing many steps into one of the karstic hills. Besides being the largest and most beautiful cave in Vietnam, the area has been used as sanctuaries for centuries. Phong Nha-Ke Bang National Park is a UNESCO World Heritage Site.
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