The World's Largest Sinkhole
A mysterious cave system in China isn't giving up its secrets.
The largest and deepest natural sinkhole on planet Earth is in southwestern China’s rural Chongqing Municipality. From space the ground looks like some strange alien footprint, dark patches amidst a sea of green. Traveling there is not easy, but if it is deep caves and underwater rivers you seek, this part of the world is the Holy Grail.
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