Mount Zhutan is right opposite Banyan Village across the river. Zhu Xi, a famous neo-confucianist, gave lectures in Xiandu in 1180 A.D., the 7th year of Chunxi period in the Southern Song Dynasty. He frequently came here in his spare time, boating on the clear lake or strolling about in the mountains. Later, people named the pond Zhutan Pond and the mountain beside the pond Mount Zhutan. Zhu Xi also styled himself as Huiweng; therefore, there is Huiweng Rock on Mount Zhutan, which is dozens of meters in height and extends over 100 meters north-southward. In the middle of the rock is Huiweng Cave, and Huiweng Pavilion was built by the cave. The clear pool, overhanging cliff, pavilion &cave, as well as shades of ancient trees make it a good place for enjoying solitude and self-cultivation.