Introduction to the black poplar tree: The black poplar tree is a tree species that grows by the water. In the past, it grew a lot along the Wujiang River. Because it has not been seen to reproduce, the black poplar tree has a high position in the hearts of the Tujia people. Take a boat from Dongfeng Pier in Yanhe County and go north along the river. About 4 kilometers away, on the west bank of Wujiang River, there is a towering ancient tree. This is the black poplar tree with a history of about a thousand years and is called the "sacred tree" by the locals. Local villagers believe that the tree has spirituality, and there is a custom of letting children recognize the "baoye". During festivals, people prepare incense and candles to worship the Wuyang "baoye".