A dozen lava tubes, including one now considered to be the longest in Southeast Asia, have recently been discovered in Vietnam. In late February, a group of cavers from Germany’s Speläoclub Berlin departed on an expedition to search for caves in two Vietnamese provinces; Dong Nai in the southeast and Quang Tri in the center. During their first week in Dong Nai, in area known for lava tubes about 100 kilometers (60 miles) northeast of Saigon, the cavers explored 12 tubes totalling some 2 kilometres (1.2 miles) in length. |