Aerial photo taken on Nov. 7, 2019 shows boats loaded with salt sailing on a river course during the autumn harvest season at a salt pan in Caofeidian District of Tangshan, north China's Hebei Province. The annual autumn harvest season of the salt pan in Caofeidian District of Tangshan has entered into its last phase. The output of sea salt in 2019 is expected to reach 1.56 million tons. (Xinhua/Yang Shiyao)