Son Doong cave 越南韓松洞

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.

越南韓松洞

2009年,英國考察隊在一個當地農民的帶領下找到越南韓松洞入口。由于它完全被叢林覆蓋，所以發現這個洞穴絕非易事。經測量，該洞穴高約650英尺（約198米）,寬500英尺（約152米）,是馬來西亞的鹿洞穴的兩倍，也是迄今為止發現的世界上最大的洞穴。據考察隊判斷，該洞穴是250萬年前由河水侵蝕山脈下的石灰岩而形成的喀斯特地貌。