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.
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.
Geographic Extremes 
