Phong Nha – Ke Bang National Park in the village of Son Trach, 55km southwest from Dong Hoi, the cave is one the largest and most beautiful known cave in Vietnam. Formed approximately 250 million years ago, it was designated an UNESCO World Heritage site in 2000. Its remarkable points are thousands of meters of underground passageways and river caves.
Before becoming a Phong Nha – Ke Bang National Park, this area had been a nature reserve with an area of 50km2. However, it was turned into a national park in 2001 with the purpose of protect forest resources, biodiversity as well as preserve scientific values of fauna and flora in North Central of Vietnam, especially rare species native to this region. The park now covers a total area of 857.52 km2 which are divided into three zones – a strictly protected zone (648,94 km2), an ecological recovery zone (174,49 km2), and an administrative service zone (34,11 km2).