Introduction to Yin Yang Valley: The sun shines on the canyon for a very short time in the day. It shines on the left side of the canyon in the morning and on the right side of the canyon in the afternoon, forming one yin and one yang, so people call it Yin Yang Valley. The canyon is about 2,500 meters long and the valley bottom is about 20-50 meters wide. Local people also call Yin Yang Valley "Jieqing Valley".