One of three very large tiankengs of the world is Dashiwei tiankeng. Now it seems unbelievable that this 613 m deep sinkhole was discovered by scientific community only in 1998.
http://www.wondermondo.com/Countries/As/China/Guangxi/Dashiwei.htm
Dashiwei tiankeng sinkhole
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By Dania @ 2011-11-03 01:02:08