Introduction to Niulan Hang: It is located between Zhangtang Stream and Jiulong Nest. It is one of the three important valleys in Wuyi Mountain Scenic Area. The valley has fertile soil and short sunshine, which provides a good environment for the growth of tea trees. It is one of the important production areas of Wuyi rock tea. There are stone pavements along the stream, and stone carvings such as "Tiger" and "Shou" on the south side of the stream.