Son Doong, the world's biggest cave is found in Vietnam. The world
largest single cave passage is in the Vietnamese jungle. It has broken
the previous world record set by The Deer cave which is in Malaysia. The
Deer cave is 300 feet wide but only a mile long.
The explorers have been able to explore 2.8 miles of Son Doong cave
before they were unable to go any further as they were blocked by flood
water. The cave is even longer