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Hang Sơn Đoòng cave is located in Vietnam near its borders with Laos.
The cave was discovered by a local man named Ho Khanh in 1991.
It is unique for its underground rainforests and a fast-flowing river.
Tourists can explore the cave only on a guided tour.
There is a limited number of tourist permits issued for conservation and safety reasons.
WORDS
cave: a hole in the earth.
permit: an official document that says one can do something.
FUN AND CREATIVE RESOURCES FOR MODERN TEACHERS
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