There is a mysterious valley - Jing manger inside the colorful sand forest which the sound of weapon collision or war horse howling resounds all year round. It is said that the king of Nanman invited King Mulu, the master of Bana cave, who had a good command of magic arts, to come to help. Digging mountain roads here and casting spells. When fighting with the Shu army, King Lu blew the horn. The birds and animals came out in the wind at once, and the horses of the Shu army were shocked and defeated without resistance. From then on, there have always been echoes of war horses which is fighting here.