Central Quang Binh Province is celebrating the 10th anniversary of UNESCO's recognition of Phong Nha-Ke Bang National Park as a World Natural Heritage Site.
The Minister of Culture, Sports and Tourism, Hoang Tuan Anh, attended a ceremony on Saturday to mark the occasion. It was held in the park's Thien Duong (Paradise) Cave, one of the longest in Asia.
"Quang Binh Province should take advantage of the help of international organisations and scientists to protect and embellish the site," Anh said.
Each year, the park attracts about 400,000 visitors, but by 2015, this is expected to jump to 2 million a year, including 100,000 foreign tourists.
A large range of fauna and floral species have been found here including tigers, Asiatic black bear, Asian elephant, giant muntjac, Asian wild dog and the recently discovered sao la.
A photo exhibition featuring the park will run until June 4 in Dong Hoi City in Quang Binh province.
A writing contest on the park was launched early this month. Titled Learning about the World Natural Heritage Site of Phong Nha-Ke Bang National Park, it aims to help people improve their awareness of the heritage of the world.