Exploring Son Doong cave in early spring
VOV -
Exploring Son Doong cave in early spring Son Dong
VOV.VN - Many tourists wish to explore the biggest cave in the world, Son Doong, between 2-5 million-years old is a massive cave system in the central province of Quang Binh. Following are photos from an expedition of a group of tourists to Son Doong cave in the early days of the New Year.