Phong Nha is in the region of Quang Binh, in Vietnam.
Quang Binh is a province located in central Vietnam that boasts a number of important destinations, one of which is Phong Nha. The city is home to the stunning Phong Nha-Ke Bang National Park, which became a UNESCO World Heritage Site in 2003. The park is known for its natural beauty, including impressive karst formations and an extensive cave system. The Son Doong Cave, which is the world's largest cave, is located here. In addition to its natural attractions, Phong Nha is also known for its historical sites, such as the Vinh Moc Tunnels and the Ho Chi Minh Trail, which played significant roles in the Vietnam War.