Lecture Hall Introduction: The Lecture Hall is about 200 meters long and 50 meters wide. It is named after the karst deposits like Luohan Lecture Hall. There is a 300-square-meter water pool in the middle, divided into two by stalactites, named "Sun Moon Lake", which is the lowest point in the whole cave. The karst in the pool is more than 20 meters high, and the bottom is more than 10 meters wide, shaped like a three-story pagoda. There is a Buddha sitting on the top, as if concentrating on the sermon; on the east side of the semicircular stone platform, many Arhats gathered to listen. Some held scriptures in their hands, some held their chins in meditation, some asked their neighbors, and some bowed their heads in meditation; the cave The wall is like a natural mural in seven colors, showing scenes of mountains, forests, seas, and fields; in the north of the pool is a steep slope, with a stone path spiraling up, and you can reach the ceiling with your hand, which is called "Motian Ridge"; on the left side, there are nine stone pillars, adjacent to each other in rows , shaped like a dragon, reaches from the bottom of the cave to the ceiling, so it is named "Nine Dragons Supporting the Sky" and is the lowest part of the cave roof.