Quang Binh Cave Festival in Dong Hoi/Phong Nha
The Quang Binh Cave Festival is a biennial tourism and culture event organized by the Quang Binh Provincial People's Committee, centered on Dong Hoi city and the Phong Nha-Ke Bang karst region. Its 2017 edition coincided with global recognition of Son Doong as the world's largest natural cave.
Quang Binh province, in north-central Vietnam, holds one of the planet's great underground landscapes: the Phong Nha-Ke Bang karst system, home to Son Doong, the cave formally recognized by the World Records Union as the largest natural cave on Earth.