Write a short paragraph about nature wonders in Vietnam.

One of the most famous nature wonder in Vietnam is Phong Nha - Ke Bang National Park. It is a world heritage recognized by UNESCO in 2003. Located in Quang Binh Province, north-central Vietnam, it not only keeps intact geology and geomorphology but also hides many mysteries of nature, which are majestic caves in limestone mountains formed millions of years ago. In addition to the wild and great beauty of the large limestone mountains, visitors also have the opportunity to learn and discover the diversity of plants, see the animals in the list of Vietnam and world red books, as well as visit and explore the most beautiful cave system in the world.