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The grotto system Phong Nha-Ke Bang
The grottos in Phong Nha-Ke Bang area can be divided into three main streams: Phong Nha Grotto system, Arch Grotto system and Wearing Out Grotto system.
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| The gate of Phong Nha cave |
Phong
Nha Grotto system has the total length of more than 40 kilometres,
proceeding from the south of Ke Bang limestone mountain area. The main
entrance is at Khe Ry Cave and Swallow Cave with the altitude of 300
metres. The caves in this system are disposed like branch-shaped, going
to the direction of eastern north - western south. In the system, Phong
Nha Grotto (also known as Teeth-Wind, Water Grotto, Lower Phong Nha)
with its full length of 7,700 metres is the grotto having most records
with "seven best": the longest water grotto; the highest and most
beautiful entrance; the most beautiful underground lake; the most
magnificent and miraculous stalactite; the longest underground river of
Vietnam; and the hugest and most beautiful dried grotto in the world.
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Stalactite at Phong Nha cave |
The entrance to the grotto is 20 metres wide. Inside the grotto are 14 caves and a 13,969-metre long underground river. The stalactites here have lasted millions years established from water dissolved with limestone and then agglomerated into many shapes such as lion-shape, throne-shape, Buddha-shape, etc. Staying closely to Phong Nha Grotto is Tien Sơn Grotto (Dried Grotto or Upper Phong Nha), another famously magnificent in this area. The entrance to this grotto is about 1,000 metres far from Phong Nha Grotto's entrance, at 200-metre altitude and 980 metres of length. Walking 400 metres from the entrance is a chasm about 10 metres deep, and then an underground stone cave nearly 500 metres long. Because it is very dangerous, tourists are not allowed to enter this area but they can only travel as far as 400 metres from the entrance.
Arch Grotto system is 30 kilometres long in total, beginning from Ruc Ca Rong Grotto and ending at Arch Grotto. It is 360 metres above the sea level. This system is on the axis which follows the common direction of south - north. Ruc Ca Rong River sometimes hides in the stone mountains, sometimes appears at deep, narrow valley, and pours into Chay River at Arch Grotto's entrance.
Wearing Out Grotto system is located in Minh Hoa District and is where Arem ethnic minority live. This system has not been explored much and the information about this system is still very limited.
Source: simplevietnam.com
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