Puong Cavern locates on Lung Nham limestone mountains in the north of Ba Be National Park. The Cavern ceiling is more than 20m high, the average width is 30m, and the Cavern heart is poetic Nang River flowing through with the length of nearly 30m.

There are many beautiful stalactites and stone pillars in the cavern. The cavern is inhabited by 23 speceis of thousands of bats.