Departure in the morning from Phong Nha and transfer to the trek’s starting point. The hike begins with a gradual descent into the jungle, crossing streams, giant bamboo groves, and dense vegetation. Lunch break in Ban Doong village, the last inhabited settlement in the valley. In the afternoon, continue the trek along the Rao Thuong River to the entrance of Hang En, a gigantic rock cathedral opening onto the jungle. Set up camp on a white sand beach inside the cave, swim, and explore the natural galleries at your leisure. Dinner prepared by the local team, overnight in a tent within the cave.