A visit to Guilin would not be complete without a visit to this cave and Reed Flute Cave - the two largest, most
          fascinating, and best-known caves in China. Seven-Star Cave is more than one and a half kilometers long. It penetrates
          several main peaks of Putuo Mountain and can accommodate tens of thousands of people. About a million years ago,
          it was an underground river channel, which, with the movement of the earth’s crust, rose above the surface to become 
          a  cavern. The cave is divided into three rock strata. The top stratum is eight to twelve meters higher than the middle
          stratum, with traces still somewhat visible. The lower stratum is an underground river, course, ten to fifteen meters lower
         than the bottom of the middle stratum. It is this middle stratum that has become a tourist attraction – an underground gallery 
         of stalactites and stalagmites in formations suggestive of forests or animals. The tunnel is 814 meters long, 43 meters at its 
         widest point, and 27 meters at its highest. In-cave temperature is about 20 ºC. The cave has been a sightseeing spot since
         the Sui and Tang dynasties more than 1,300 years ago. Over the centuries many poems and other inscriptions have been 
         left behind on its walls by visitors.