There are actually several different holes in the ground where people can base jump into. One of them is the 1200-feet deep Cave of Swallows, located in Tampico, Mexico. Another one is the 680-meter deep Tiankeng (Sky Hole) in China, which is known as the world’s largest sinkhole.
Thé exact location of the Tian Kengdifeng is:
30° 46′ 22″ N 109° 29′ 54″ E
Plenty of pictures available ni Google Earth and Panoramio
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