Son Doong

Son Doong cave is World's largest cave
Location Quảng Bình Province, Vietnam
Coordinates 17°27′25″N 106°17′15″ECoordinates: 17°27′25″N 106°17′15″E
Depth Max 150m / 490ft
Length Approx 9,000 m / 30,000 ft
Discovery 1991 [AD] by Hồ Khanh
Geology Permo-Carboniferous limestone
Entrances Approx 2
Hazards Underground river
Cave survey 2009, British/Vietnamese
Son Doong cave(Vietnamese: Hang Son Doong) is world's largest cave, located in
Quang Binh province, Vietnam. It is found by a local man named Ho Khanh in 1991 and was recently
discovered in 2009 by British cavers, led by Howard Limbert. 

The name "Son Doong" cave means
"mountain river cave", It was created 2-5 million years ago by river water eroding away the limestone
underneath the mountain Where the limestone was weak, the ceiling collapsed creating huge skylights.