means limestone as width found largest Son Doong cave is world's (1)................ cave, located in Quang Binh province, Vietnam. It was (2)........... by a local man named Ho Khanh in 1991 and was recently discovered in 2009 by British cavers, let by Howard Limbert. The name"Son Doong" cave ( 3)................ "mountain river cave". The cave was created 2-5 million years ago by river water eroding away the (4)..................... underneath the mountain. At about 9 kilometers in length, 200 meters in (5).......................... and 150 meters in height, Son Doong Cave is (6)....................... larger then Deer Cave in Malaysia and has replaced Deer Cave to take pole position (7)...................... the world largest cave.