What to buy now Camp at one of the world’s largest caverns in Vietnam By TTG Asia / Posted on 4 June, 2021 6:54 Luxury travel specialist Unforgettable Travel is offering adventurous campers the chance to experience a unique overnight stay at the entrance of one of the world’s largest caverns. Located in Vietnam’s Phong Nha-Kẻ Bàng National Park, Hang Sơn Đoòng and Hang Én are the world’s largest and third-largest caves, respectively. At almost 6km long, Hang Sơn Đoòng has sections reaching up to 200m tall and 150m wide. Hang Sơn Đoòng is the world’s largest natural cave Tourists can now experience the wonder of these breathtaking natural formations and enjoy a night camping experience in the entrance chamber of Hang Én with any Vietnam tour booking under Unforgettable Travel. Located 20km away from Vietnam’s border with Laos, the Phong Nha-Kẻ Bàng National Park is a UNESCO World Heritage Site, and is surrounded by the dense jungle found close to the central northern coast of the country. Discovered only in 2009, Hang Sơn Đoòng and Hang Én are estimated to be between two and five million years old. The naturally formed stone caverns first opened to the public in 2013 after several years of extensive exploration, and only permit a limited number of visitors every year. The caves are only accessible by a helicopter or four-hour jungle trek from the nearest road.