Phong Nha-Ke Bang national park has been recognised as a world natural heritage site by the UNESCO. Phong Nha-Ke Bang national park is located to the north of the Truong Son range in central Quang Binh province. The boat trip on the river to Phong Nha cave is so beautiful. Phong Nha has the longest underground rivers, the largest caverns and passageways, the widest and prettiest sand banks, and the most astonishing rock formations in the world.

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