VOV.VN - All 1,000 exclusive adventure tours taking visitors into the world’s largest cave of Son Doong in central Quang Binh province have been fully booked for the year ahead, according to Tourist Company Oxalis Adventure Tours.
VOV.VN - Exclusive adventure tours taking visitors into Son Doong cave, the largest cave in the world located in Quang Binh province, are fully booked for the entirety of the year ahead, said Nguyen Chau A, director of Tourist Company Oxalis Adventure Tours.