Langshan loacated at Hunan province in China. It's Danxia landform like Guilin.The rock's shape are very special and a 238.8 meters long crack between two 80-120 meters high rocks are very narrow , the widest is 0.8m, the narrowest is only 0.33m. If your are too fat then you can not pass it. Langshan is belong to the world heritage. very beautiful. Good for 2 or 3 days holiday.
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From @rosebach