Introduction to Yanzikou: Yanzikou and Jiuqudong are the most dangerous sections of the cross-highway project. This dangerous road has 18 twists and turns and winds through caves on the mountain wall. It is 800 meters long and takes about 40 minutes to walk. minute. On the stone wall at the entrance are the characters "Nine Curved Cave" written by General Huang Jie and "Nine Curved Panlong" written by calligrapher Liang Hancao.