Lugou is known as Qionglai's bamboo sea. A road winding into the ditch, pedestrians walking in the middle of it like mountains and forests, changing scenery step by step. The ditch is filled with bluestones, and bamboos above the rocks are all common Cizhu in Dazi, western Sichuan. The fibers are rich and tough, and they are the main raw materials for papermaking. It's still cooler in the ditch. It's a summer resort.