I slept overnight in the world's largest cave in Vietnam

As the sun dips below the horizon, I pitch my tent on the sand.

My fellow campers are busy setting up their beds for the night. Leaving my door unzipped, I lay on top of my sleeping bag and look out at the magnificence of our surroundings.

This spot in Vietnam is a strip of sand like no other as it lies deep within Phong Nha-Ke Bang National Park - inside the colossal cave chamber of Son Doong.

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