Formed approximately 250 million years ago, Phong Nha Cave is the largest and most beautiful known cave in Viet Nam. Located in the village of Son Trach, 55 km northwest of Dong Hoi,Quang Binh province.It was designated a Unesco World Heritage in 2000.
It's remarkable for its thousands of mettres of Underground passageways and river caves filled with stalactites and stalagmites.
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