|A new untouched cave in Quang Binh province discovered by experts of British Royal Cave Association. (Photo courtesy of the British Royal Cave Association)
Running for more than 3,300 m, the caves also feature underground rivers which are completely pristine. Experts of the British Royal Cave Association found Son Doong cave in Quang Binh Province, known as the nation’s kingdom of caves, through a local resident in 2009.
The cave has since been accredited as the world’s largest and most beautiful natural cave by the World Records Union and the World Records Association.