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09- Phong Nha in Quang Binh
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Phong Nha Ke Bang national park
Hang En cave (16)
Hang Toi cave (7)
Nuoc Mooc Spring (7)
Phong Nha cave (16)
Son Doong cave (16)
Thien Duong cave (27)
Thuy Cung cave (8)
Tien Son cave (8)