Hongcheng Hot Spring lies in Qidong County. The spring is surrounded by mountains and the water is always warm and clear. The spring is not affected by the rainy season. Although there is rain all year round, it is warm in winter and cool in summer. Visitors can bathe in winter. Hongcheng Hot Spring was discovered around the year 1198. Zhang Yanyuan, a celebrity in Ming-dynasty Chang’an, wrote poems on the rocks here.