
Hang Son Doong cave (Vietnam's: Hang out Hang Sơn Đoòng Đông Sơn meaning Cave of the mountain) is located in Bo Trach District, in the north of Dong Hoi, in the province of Quang Binh in Vietnam. It is part of the National Park Phong Nha-Ke Bang, near the border with Laos. It is currently considered the largest underground gallery in the world. We could build an entire neighborhood there forty floors of buildings. This is one of the twenty new caves...