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Location: Tien Son Grotto lies in Phong Nha
- Ke Bang tourist complex that comprises natural beauty-spots in Quang Binh
Province.
Characteristics: The grotto looks marvelous inside with hundreds of
stalagmites and stalactites of different sizes and shape.
The site is now on the list to be recommended to UNESCO for recognition as a
World Heritage Site.
Tien Son Grotto was discovered in April 1935 in the limestone mountain of Ke
Bang. It is about 400m away from the famous Phong Nha Grotto and at a height of
135m. Tien Son Grotto is more than 980m long. Going into the cave for about
400m, visitors will see an abyss, about 10m deep. Then comes another part of the
cave, about 500m long is rather dangerous for walking. At present, nearly 400m
of the cave have been installed with lighting system to make it safe for
visitors. Some look like a man or an animal, and there is one that looks like
the Learning Tower of Pisa in Italy. On the cave ceiling, there are glittering
gold and silver-like veins. Some stalagmites produce an echoing sound when
slightly knocked.
Limber Howard, Chief of the British Royal Team of Cave Researchers, who visited
and made studies of the site, said that Tien Son Grotto may have been formed
tens of millions of years ago. A river ran through the limestone mountain and
eroded it. Then huge rocks fell, separated the mountain and form the cave. An
under ground river ran through the lower part of the mountain, creating Phong
Nha Grotto. Thus, Tien Son Grotto is older than Phong Nha Grotto and they do not
link with each other. Geographical tectonics in Tien Son Grotto is rather
stable.
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