Phong Nha Caves are the complex of 14 grottoes situated in a region of limestone mountains in Ke Bang National Park. Phong Nha Cave have a total length of 7,729 m. Phong Nha Cave were listed as a World Natural Heritage Site in July of 2003 by Unesco

The fauna of Bach Ma National Park is very various with a lot of endemic and rare species. Until now, scientists have identified 1.493 species including 132 species of mammals (occupy half of all mammals known in Vietnam), 358 bird species, 31 reptile species, 21 frog species , 57 fish species and 894 insect species.