It is located in Dieu Do village in Quang Ninh District's Truong Son Commune, an hour's drive from Dong Hoi, the capital of Quang Binh Province.

Explorers inside Son Nu, a newly-discovered cave in the middle of the Truong Son (Annamite) Mountain Range in Quang Binh Province.

There is a stream with clear blue waters that allow people to row a boat the entire length of cave, Hoang Trong Duc, chairman of Truong Son Commune, who joined local residents to explore the cave, said.

The cave has been named Son Nu (Mountain Girl).

"To get to the cave, you have to walk 1.5 km from the commune and then about an hour over rocky paths," Duc said.

He hoped it would be developed into a tourist destination, creating jobs for locals.

With more than 500 caves discovered so far, Quang Binh is renowned as the country's kingdom of caves.

They include Son Doong, the world's largest, and En and Pigmy, the second and fourth largest.

There are over 40 caves that tourists are allowed to visit.

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Source: VnExpress