LONGEST CAVE IN THE WORLD

                                  DID YOU KNOW? 

The longest cave in the world is in vietnam and is so big that it has own river, jungle and climate. 

HANG  SON  DOONG  in Vietnam is the largest known cave in the world.

Location-- Quảng Bình Province, Vietnam

Coordinates-- 17°27′25″N 106°17′15″E

Depth max.-- 150 metres (490 ft)

Length approx.-- 9 kilometres (5.6 mi)

Discovery-- 1991 [AD] by Hồ Khanh

Geology permo-Carboniferous limestone

Entrances-- 2

Hazards-- Underground river

                            DISCOVERY

The entrance to Hang Sơn Đoòng was found in 1991 by a local man named Hồ Khanh, while searching for agarwood, a valuable timber. The whistling sound of wind and the roar of a rushing stream issuing from the cave, heard through the entrance, as well as the steep descent, discouraged Hồ Khanh from entering the cave.

Only in 2009 did the cave become internationally known after a group of cavers from the British Cave Research Association conducted a survey in Phong.Their progress was stopped by a large, 60-metre (200 ft) high flowstone-coated wall,which was named the Great Wall of Vietnam.

                            DISCRIPTION

The main Sơn Đoòng cave passage is the largest known cave passage in the world by volume – 38.4×106 cubic metres (1.36×109 cu ft). The cave contains some of the tallest known stalagmites in the world, which are up to 70 m tall. Behind the Great Wall of Vietnam were found cave pearls the size of baseballs, an abnormally large size.

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