Introduction to Longwangjing: When Miyin Temple was first built, there were many monks and craftsmen and lack of water. According to legend, the protector Dragon King came to help. The Dragon King used his staff to draw a tic-tac on the open space of the temple. After a golden light passed, the land in the tic-tac immediately subsided and turned into a well. Everyone tried to drink it, and it was refreshing and delicious. Today, clear spring water continues to flow out of the dragon's mouth less than one meter away from the well mouth. No matter how much water is taken away, the water level will not lower or rise. After testing, the water is rich in selenium and is indeed a rare natural mineral water.