Introduction to Shanyanjing: It is said that in ancient times, Beidaihe had good weather. Suddenly, disasters occurred one year after another, and people were in great panic. An eminent monk in Guanyin Temple received guidance from Guanyin Bodhisattva in his dream, and learned that it was caused by fools who disturbed the sand and stones. The mountain god's mansion was blocked, so three deep wells were drilled halfway up the southern foot of Jiguan Mountain to ventilate the mountain god. They were called "mountain wells".