Winner of online contest to get free tour of marvelous Son Doong Cave; Nhan Dan

NDO – An online knowledge contest on Phong Nha – Ke Bang National Park was launched on June 6 with the grand prize being a US$6,000 tour to explore Son Doong – the largest cave in the world.

Source: Winner of online contest to get free tour of marvelous Son Doong Cave

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